Jürgen Ehlers (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Jürgen Ehlers" in English language version.

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adwmainz.de

Berlin: Huisken, Nicolai & Schutz 2009; initial membership date in brief note on p.35 of the same publication. Mainz: p. 13 of Lütjen-Drecoll 2008. Leopoldina: listed as member on Mitgliederverzeichnis, Deutsche Akademie der Naturforscher Leopoldina, retrieved 28 May 2012 (in German, English translation of title: Members list). Bavarian Academy: Trümper 2009. Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Lütjen-Drecoll, Elke, ed. (2008), Newsletter 1/08 (PDF), Akademie der Wissenschaften und der Literatur Mainz^{[permanent dead link]} (in German) Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154

arxiv.org

Olive 1996 Olive, D. I. (1996), "Exact Electromagnetic Duality", Nucl. Phys. B Proc. Suppl., 45A (1): 88–102, arXiv:hep-th/9508089, Bibcode:1996NuPhS..45...88O, doi:10.1016/0920-5632(95)00618-4, S2CID 8584458
Maison op. cit., Geroch 1971, and, for various applications, Mars 2001. Geroch, R. (1971), "A method for generating new solutions of Einstein's field equation. I", J. Math. Phys., 12 (6): 918–924, Bibcode:1971JMP....12..918G, doi:10.1063/1.1665681 Mars, Marc (2001), "Space-time Ehlers group: Transformation law for the Weyl tensor", Class. Quantum Grav., 18 (4): 719–738, arXiv:gr-qc/0101020, Bibcode:2001CQGra..18..719M, doi:10.1088/0264-9381/18/4/311, S2CID 16943248
Seitz, Schneider & Ehlers 1994, cf. section 3.5 of Annual Report 1994, Max Planck Institute for Astrophysics, 1995, archived from the original on 19 May 2009 Seitz, S.; Schneider, P.; Ehlers, J. (1994), "Light propagation in arbitrary spacetimes and the gravitational lens approximation", Class. Quantum Grav., 11 (9): 2345–2383, arXiv:astro-ph/9403056, Bibcode:1994CQGra..11.2345S, doi:10.1088/0264-9381/11/9/016, S2CID 18176981
Oliynyk & Schmidt 2009 Oliynyk, Todd Andrew; Schmidt, Bernd (2009), "Existence of families of spacetimes with a Newtonian limit", General Relativity and Gravitation, 41 (9): 2093–2111, arXiv:0908.2832, Bibcode:2009GReGr..41.2093O, doi:10.1007/s10714-009-0843-5, S2CID 12396713
See Buchert & Ehlers 1993, Buchert & Ehlers 1997a and Buchert & Ehlers 1997b. The current status of Buchert's further work is summarized in Buchert 2008. Buchert, Thomas; Ehlers, Jürgen (1993), "Lagrangian theory of gravitational instability of Friedmann-Lemaître cosmologies – second-order approach: an improved model for nonlinear clustering", Mon. Not. R. Astron. Soc., 264 (2): 375–387, Bibcode:1993MNRAS.264..375B, doi:10.1093/mnras/264.2.375, hdl:11858/00-001M-0000-0013-5C2D-A Buchert, Thomas; Ehlers, Jürgen (1997a), "Averaging inhomogeneous Newtonian cosmologies", Astron. Astrophys., 320: 1–7, arXiv:astro-ph/9510056, Bibcode:1997A&A...320....1B Buchert, Thomas; Ehlers, Jürgen (1997b), "Newtonian cosmology in Lagrangian formulation: foundations and perturbation theory", General Relativity and Gravitation, 29 (6): 733–764, arXiv:astro-ph/9609036, Bibcode:1997GReGr..29..733E, doi:10.1023/A:1018885922682, S2CID 15670330 Buchert, Thomas (2008), "Dark Energy from Structure—A Status Report", General Relativity and Gravitation, 40 (2–3): 467–527, arXiv:0707.2153, Bibcode:2008GReGr..40..467B, doi:10.1007/s10714-007-0554-8, S2CID 17281664

badw.de

A review of the book itself is Bleyer 1993. The long-term impact can be judged by the way it is held up as a reference in the reviews of later books on the same topic, e.g. Perlick 2005 and Bozza 2005; see also the assessment of Trümper 2009, p. 154. Bleyer, U. (1993), "Book-Review - Gravitational Lenses", Astronomische Nachrichten, 314 (4): 314–315, Bibcode:1993AN....314..314S, doi:10.1002/asna.2113140412 Perlick, Volker (2005), "Book review:Petters, A.O., Levine, H., Wambsganss, J.: Singularity theory and gravitational lensing", Gen. Relativ. Gravit., 37 (2): 435–436, Bibcode:2005GReGr..37..435P, doi:10.1007/s10714-005-0033-z, S2CID 122607061 Bozza, Valerio (2005), "Book review: Silvia Mollerach, Esteban Roulet: Gravitational Lensing and Microlensing", General Relativity and Gravitation, 37 (7): 1335–1336, Bibcode:2005GReGr..37.1335B, doi:10.1007/s10714-005-0117-9, S2CID 120764050 Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154
Berlin: Huisken, Nicolai & Schutz 2009; initial membership date in brief note on p.35 of the same publication. Mainz: p. 13 of Lütjen-Drecoll 2008. Leopoldina: listed as member on Mitgliederverzeichnis, Deutsche Akademie der Naturforscher Leopoldina, retrieved 28 May 2012 (in German, English translation of title: Members list). Bavarian Academy: Trümper 2009. Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Lütjen-Drecoll, Elke, ed. (2008), Newsletter 1/08 (PDF), Akademie der Wissenschaften und der Literatur Mainz^{[permanent dead link]} (in German) Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154
Max Planck Medal: Press release about the 2002 awards, Physikalische Spitzenleistung, Deutsche Physikalische Gesellschaft, 17 December 2001, archived from the original on 13 February 2007, retrieved 27 May 2008 (in German, English translation of title: Top achievement in physics), and Rogalla 2001. Volta Medal: "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, 18 May 2005, retrieved 27 May 2008 (in German) and "Medaille für Golmer Forscher", Märkische Allgemeine Zeitung, 19 May 2005 (in German, English translation of title: Medal for researcher from Golm). Charles University Medal: Trümper 2009, p. 154. Rogalla, Thomas (28 December 2001), "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, retrieved 28 May 2013 (in German) Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154

bbaw.de

edoc.bbaw.de

Huisken, Nicolai & Schutz 2009, cf. the English version online as Huisken, Nicolai & Schutz 2008, and the associated CV, Lebenslauf von Prof. Dr. Jürgen Ehlers (PDF), Max Planck Institute for Gravitational Physics, 27 May 2008, archived from the original (PDF) on 19 May 2009, retrieved 27 May 2008 (in German, English translation of title: "CV for Prof. Dr. Jürgen Ehlers"). Dates and positions also summarized in Weber & Borissoff 1998. Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2008), Obituary: Jürgen Ehlers (PDF), Max Planck Institute for Gravitational Physics, archived from the original (PDF) on 11 May 2011 Weber, Peter; Borissoff, Irene, eds. (1998), Handbuch der Wissenschaftlichen Mitglieder, Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., p. 38 (in German, English translation of title: Handbook of Scientific Members).
Huisken, Nicolai & Schutz 2009; English version online as Huisken, Nicolai & Schutz 2008 Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2008), Obituary: Jürgen Ehlers (PDF), Max Planck Institute for Gravitational Physics, archived from the original (PDF) on 11 May 2011
Berlin: Huisken, Nicolai & Schutz 2009; initial membership date in brief note on p.35 of the same publication. Mainz: p. 13 of Lütjen-Drecoll 2008. Leopoldina: listed as member on Mitgliederverzeichnis, Deutsche Akademie der Naturforscher Leopoldina, retrieved 28 May 2012 (in German, English translation of title: Members list). Bavarian Academy: Trümper 2009. Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Lütjen-Drecoll, Elke, ed. (2008), Newsletter 1/08 (PDF), Akademie der Wissenschaften und der Literatur Mainz^{[permanent dead link]} (in German) Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154

berliner-zeitung.de

Max Planck Medal: Press release about the 2002 awards, Physikalische Spitzenleistung, Deutsche Physikalische Gesellschaft, 17 December 2001, archived from the original on 13 February 2007, retrieved 27 May 2008 (in German, English translation of title: Top achievement in physics), and Rogalla 2001. Volta Medal: "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, 18 May 2005, retrieved 27 May 2008 (in German) and "Medaille für Golmer Forscher", Märkische Allgemeine Zeitung, 19 May 2005 (in German, English translation of title: Medal for researcher from Golm). Charles University Medal: Trümper 2009, p. 154. Rogalla, Thomas (28 December 2001), "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, retrieved 28 May 2013 (in German) Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154

books.google.com

Arimondo, E.; Ertmer, W.; Schleich, W.; Rasel, E.M. (2009). Atom Optics and Space Physics: Proceedings of the International School of Physics "Enrico Fermi", Course CLXVIII, Varenna on Lake Como, Villa Monastero, 3-13 July 2007. International School of Physics Enrico Fermi. IOS Press. p. 9. ISBN 978-1-58603-990-5. Retrieved 28 December 2022.

doi.org

The dissertation is Ehlers 1957; cf. Ellis 2009. Ehlers, Jürgen (1957), Konstruktionen und Charakterisierungen von Lösungen der Einsteinschen Gravitationsfeldgleichungen, University of Hamburg (dissertation, in German; title in English translation: Constructions and characterizations of solutions to Einstein's gravitational field equations) Ellis, George (2009), "Editorial note to: Pascual Jordan, Jürgen Ehlers, and Wolfgang Kundt, Exact solutions of the field equations of the general theory of relativity", General Relativity and Gravitation, 41 (9): 2170–2189, Bibcode:2009GReGr..41.2179E, doi:10.1007/s10714-009-0868-9
As described in Ellis & Krasiński 2007 and Sachs 2009. Ellis, George; Krasiński, Andrzej (2007), "Editors' comment", General Relativity and Gravitation, 39 (11): 1941–1942, Bibcode:2007GReGr..39.1929S, doi:10.1007/s10714-007-0448-9, hdl:11858/00-001M-0000-0013-47A1-D, S2CID 121554142, archived from the original on 3 March 2016, retrieved 8 July 2008 Sachs, Rainer (2009), "Some memories of Juergen", General Relativity and Gravitation, 41 (9): 1903–1904, Bibcode:2009GReGr..41.1903S, doi:10.1007/s10714-009-0784-z
Ellis 2009 Ellis, George (2009), "Editorial note to: Pascual Jordan, Jürgen Ehlers, and Wolfgang Kundt, Exact solutions of the field equations of the general theory of relativity", General Relativity and Gravitation, 41 (9): 2170–2189, Bibcode:2009GReGr..41.2179E, doi:10.1007/s10714-009-0868-9
Ellis 2009, p. 2180 Ellis, George (2009), "Editorial note to: Pascual Jordan, Jürgen Ehlers, and Wolfgang Kundt, Exact solutions of the field equations of the general theory of relativity", General Relativity and Gravitation, 41 (9): 2170–2189, Bibcode:2009GReGr..41.2179E, doi:10.1007/s10714-009-0868-9
The English translation, by G. F. R. Ellis, is Ehlers 1993. The quotation can be found on p. 1225 in the editor's comments section. Ehlers, J. (1993), "Contributions to the relativistic mechanics of continuous media", Gen. Rel. Grav., 25 (12): 1225–1266, Bibcode:1993GReGr..25.1225E, doi:10.1007/BF00759031, hdl:11858/00-001M-0000-0013-5C1E-C, S2CID 122689869
Olive 1996 Olive, D. I. (1996), "Exact Electromagnetic Duality", Nucl. Phys. B Proc. Suppl., 45A (1): 88–102, arXiv:hep-th/9508089, Bibcode:1996NuPhS..45...88O, doi:10.1016/0920-5632(95)00618-4, S2CID 8584458
Maison op. cit., Geroch 1971, and, for various applications, Mars 2001. Geroch, R. (1971), "A method for generating new solutions of Einstein's field equation. I", J. Math. Phys., 12 (6): 918–924, Bibcode:1971JMP....12..918G, doi:10.1063/1.1665681 Mars, Marc (2001), "Space-time Ehlers group: Transformation law for the Weyl tensor", Class. Quantum Grav., 18 (4): 719–738, arXiv:gr-qc/0101020, Bibcode:2001CQGra..18..719M, doi:10.1088/0264-9381/18/4/311, S2CID 16943248
Hawking & Ellis 1973, p. 351ff. The original work is Ehlers, Geren & Sachs 1968. Hawking, Stephen W.; Ellis, George F. R. (1973), The large scale structure of space-time, Cambridge University Press, ISBN 0-521-09906-4 Ehlers, J.; Geren, P.; Sachs, R. K. (1968), "Isotropic solutions of Einstein-Liouville equations", J. Math. Phys., 9 (9): 1344–1349, Bibcode:1968JMP.....9.1344E, doi:10.1063/1.1664720, hdl:11858/00-001M-0000-0013-5EFE-8
See Köhler & Schattner 1979. The original publication is Ehlers & Rudolph 1977. Köhler, Egon; Schattner, Ruprecht (1979), "Some results on pseudorigid motions", General Relativity and Gravitation, 10 (8): 709–716, Bibcode:1979GReGr..10..709K, doi:10.1007/BF00756906, S2CID 121458325 Ehlers, Jürgen; Rudolph, Ekkart (1977), "Dynamics of extended bodies in general relativity center-of-mass description and quasirigidity", General Relativity and Gravitation, 8 (3): 197–217, Bibcode:1977GReGr...8..197E, doi:10.1007/BF00763547, hdl:11858/00-001M-0000-0013-5EBF-5, S2CID 59429452, archived from the original on 28 September 2019, retrieved 13 July 2019.
A review of the book itself is Bleyer 1993. The long-term impact can be judged by the way it is held up as a reference in the reviews of later books on the same topic, e.g. Perlick 2005 and Bozza 2005; see also the assessment of Trümper 2009, p. 154. Bleyer, U. (1993), "Book-Review - Gravitational Lenses", Astronomische Nachrichten, 314 (4): 314–315, Bibcode:1993AN....314..314S, doi:10.1002/asna.2113140412 Perlick, Volker (2005), "Book review:Petters, A.O., Levine, H., Wambsganss, J.: Singularity theory and gravitational lensing", Gen. Relativ. Gravit., 37 (2): 435–436, Bibcode:2005GReGr..37..435P, doi:10.1007/s10714-005-0033-z, S2CID 122607061 Bozza, Valerio (2005), "Book review: Silvia Mollerach, Esteban Roulet: Gravitational Lensing and Microlensing", General Relativity and Gravitation, 37 (7): 1335–1336, Bibcode:2005GReGr..37.1335B, doi:10.1007/s10714-005-0117-9, S2CID 120764050 Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154
Seitz, Schneider & Ehlers 1994, cf. section 3.5 of Annual Report 1994, Max Planck Institute for Astrophysics, 1995, archived from the original on 19 May 2009 Seitz, S.; Schneider, P.; Ehlers, J. (1994), "Light propagation in arbitrary spacetimes and the gravitational lens approximation", Class. Quantum Grav., 11 (9): 2345–2383, arXiv:astro-ph/9403056, Bibcode:1994CQGra..11.2345S, doi:10.1088/0264-9381/11/9/016, S2CID 18176981
Ehlers 1997; a description can be found on p. 216f. in Luc Blanchet's contribution "Post-Newtonian Gravitational Radiation", pp. 225–271 in Schmidt 2000. Ehlers, Jürgen (January 1997), "Examples of Newtonian limits of relativistic spacetimes" (PDF), Classical and Quantum Gravity, 14 (1A): A119–A126, Bibcode:1997CQGra..14A.119E, doi:10.1088/0264-9381/14/1A/010, hdl:11858/00-001M-0000-0013-5AC5-F, S2CID 250804865 Schmidt, Bernd, ed. (2000), Einstein's Field Equations and their Physical Implications. Selected Essays in Honour of Jürgen Ehlers, Springer, ISBN 3-540-67073-4
Oliynyk & Schmidt 2009 Oliynyk, Todd Andrew; Schmidt, Bernd (2009), "Existence of families of spacetimes with a Newtonian limit", General Relativity and Gravitation, 41 (9): 2093–2111, arXiv:0908.2832, Bibcode:2009GReGr..41.2093O, doi:10.1007/s10714-009-0843-5, S2CID 12396713
A description that includes the historical context can be found in Schutz 1996. The original work is Ehlers et al. 1976. Schutz, B. F. (1996), "Making the Transition from Newton to Einstein: Chandrasekhar's Work on the Post-Newtonian Approximation and Radiation Reaction" (PDF), J. Astrophys. Astron., 17 (3–4): 183–197, Bibcode:1996JApA...17..183S, doi:10.1007/BF02702303, hdl:11858/00-001M-0000-0013-7535-E, S2CID 73579437 Ehlers, J.; Rosenblum, A.; Goldberg, J. N.; Havas, Peter (1976), "Comments on gravitational radiation damping and energy loss in binary systems", Astrophys. J., 208: L77, Bibcode:1976ApJ...208L..77E, doi:10.1086/182236, hdl:11858/00-001M-0000-0013-5EC4-8.
See Buchert & Ehlers 1993, Buchert & Ehlers 1997a and Buchert & Ehlers 1997b. The current status of Buchert's further work is summarized in Buchert 2008. Buchert, Thomas; Ehlers, Jürgen (1993), "Lagrangian theory of gravitational instability of Friedmann-Lemaître cosmologies – second-order approach: an improved model for nonlinear clustering", Mon. Not. R. Astron. Soc., 264 (2): 375–387, Bibcode:1993MNRAS.264..375B, doi:10.1093/mnras/264.2.375, hdl:11858/00-001M-0000-0013-5C2D-A Buchert, Thomas; Ehlers, Jürgen (1997a), "Averaging inhomogeneous Newtonian cosmologies", Astron. Astrophys., 320: 1–7, arXiv:astro-ph/9510056, Bibcode:1997A&A...320....1B Buchert, Thomas; Ehlers, Jürgen (1997b), "Newtonian cosmology in Lagrangian formulation: foundations and perturbation theory", General Relativity and Gravitation, 29 (6): 733–764, arXiv:astro-ph/9609036, Bibcode:1997GReGr..29..733E, doi:10.1023/A:1018885922682, S2CID 15670330 Buchert, Thomas (2008), "Dark Energy from Structure—A Status Report", General Relativity and Gravitation, 40 (2–3): 467–527, arXiv:0707.2153, Bibcode:2008GReGr..40..467B, doi:10.1007/s10714-007-0554-8, S2CID 17281664
See Ehlers 2006a and Breuer & Springer 2001 as well as its later English translation Breuer & Springer 2009, as well as Ehlers 2005. Ehlers, Jürgen (2006a), "Physikalische Erkenntnis, dargestellt am Beispiel des Übergangs von Newtons Raumzeit zu Einsteins spezieller Relativitätstheorie", in Balsinger, Philipp W.; Kötter, Rudolf (eds.), Die Kultur moderner Wissenschaft am Beispiel Albert Einstein, Elsevier/Spektrum Akademie Verlag, pp. 1–16, archived from the original on 24 March 2018, retrieved 8 July 2008 (in German, English translation of title: Gaining knowledge in physics, shown for the example of the transition from Newton's spacetime to Einstein's special theory of relativity) Breuer, Reinhard; Springer, Michael (2001), "Die Wahrheit in der Wissenschaft", Spektrum der Wissenschaft, 7: 70 (in German) Breuer, Reinhard; Springer, Michael (2009), "The truth in science", General Relativity and Gravitation, 41 (9): 2159–2167, Bibcode:2009GReGr..41.2159B, doi:10.1007/s10714-009-0844-4, S2CID 123226152 Ehlers, Jürgen (2005), "Modelle in der Physik", Modelle des Denkens, Berlin-Brandenburgische Akademie der Wissenschaften, pp. 35–40 (in German, English translation of contribution title: Models in physics; English translation of title: Models of thinking)
Nicolai, Ellis & Schmidt 2009 Nicolai, Hermann; Ellis, George; Schmidt, Bernd (2009), "Editorial", General Relativity and Gravitation, 41 (9): 1897, Bibcode:2009GReGr..41.1897., doi:10.1007/s10714-009-0867-x

dpg-physik.de

Max Planck Medal: Press release about the 2002 awards, Physikalische Spitzenleistung, Deutsche Physikalische Gesellschaft, 17 December 2001, archived from the original on 13 February 2007, retrieved 27 May 2008 (in German, English translation of title: Top achievement in physics), and Rogalla 2001. Volta Medal: "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, 18 May 2005, retrieved 27 May 2008 (in German) and "Medaille für Golmer Forscher", Märkische Allgemeine Zeitung, 19 May 2005 (in German, English translation of title: Medal for researcher from Golm). Charles University Medal: Trümper 2009, p. 154. Rogalla, Thomas (28 December 2001), "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, retrieved 28 May 2013 (in German) Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154

handle.net

hdl.handle.net

As described in Ellis & Krasiński 2007 and Sachs 2009. Ellis, George; Krasiński, Andrzej (2007), "Editors' comment", General Relativity and Gravitation, 39 (11): 1941–1942, Bibcode:2007GReGr..39.1929S, doi:10.1007/s10714-007-0448-9, hdl:11858/00-001M-0000-0013-47A1-D, S2CID 121554142, archived from the original on 3 March 2016, retrieved 8 July 2008 Sachs, Rainer (2009), "Some memories of Juergen", General Relativity and Gravitation, 41 (9): 1903–1904, Bibcode:2009GReGr..41.1903S, doi:10.1007/s10714-009-0784-z
The English translation, by G. F. R. Ellis, is Ehlers 1993. The quotation can be found on p. 1225 in the editor's comments section. Ehlers, J. (1993), "Contributions to the relativistic mechanics of continuous media", Gen. Rel. Grav., 25 (12): 1225–1266, Bibcode:1993GReGr..25.1225E, doi:10.1007/BF00759031, hdl:11858/00-001M-0000-0013-5C1E-C, S2CID 122689869
Hawking & Ellis 1973, p. 351ff. The original work is Ehlers, Geren & Sachs 1968. Hawking, Stephen W.; Ellis, George F. R. (1973), The large scale structure of space-time, Cambridge University Press, ISBN 0-521-09906-4 Ehlers, J.; Geren, P.; Sachs, R. K. (1968), "Isotropic solutions of Einstein-Liouville equations", J. Math. Phys., 9 (9): 1344–1349, Bibcode:1968JMP.....9.1344E, doi:10.1063/1.1664720, hdl:11858/00-001M-0000-0013-5EFE-8
See Köhler & Schattner 1979. The original publication is Ehlers & Rudolph 1977. Köhler, Egon; Schattner, Ruprecht (1979), "Some results on pseudorigid motions", General Relativity and Gravitation, 10 (8): 709–716, Bibcode:1979GReGr..10..709K, doi:10.1007/BF00756906, S2CID 121458325 Ehlers, Jürgen; Rudolph, Ekkart (1977), "Dynamics of extended bodies in general relativity center-of-mass description and quasirigidity", General Relativity and Gravitation, 8 (3): 197–217, Bibcode:1977GReGr...8..197E, doi:10.1007/BF00763547, hdl:11858/00-001M-0000-0013-5EBF-5, S2CID 59429452, archived from the original on 28 September 2019, retrieved 13 July 2019.
Ehlers 1997; a description can be found on p. 216f. in Luc Blanchet's contribution "Post-Newtonian Gravitational Radiation", pp. 225–271 in Schmidt 2000. Ehlers, Jürgen (January 1997), "Examples of Newtonian limits of relativistic spacetimes" (PDF), Classical and Quantum Gravity, 14 (1A): A119–A126, Bibcode:1997CQGra..14A.119E, doi:10.1088/0264-9381/14/1A/010, hdl:11858/00-001M-0000-0013-5AC5-F, S2CID 250804865 Schmidt, Bernd, ed. (2000), Einstein's Field Equations and their Physical Implications. Selected Essays in Honour of Jürgen Ehlers, Springer, ISBN 3-540-67073-4
A description that includes the historical context can be found in Schutz 1996. The original work is Ehlers et al. 1976. Schutz, B. F. (1996), "Making the Transition from Newton to Einstein: Chandrasekhar's Work on the Post-Newtonian Approximation and Radiation Reaction" (PDF), J. Astrophys. Astron., 17 (3–4): 183–197, Bibcode:1996JApA...17..183S, doi:10.1007/BF02702303, hdl:11858/00-001M-0000-0013-7535-E, S2CID 73579437 Ehlers, J.; Rosenblum, A.; Goldberg, J. N.; Havas, Peter (1976), "Comments on gravitational radiation damping and energy loss in binary systems", Astrophys. J., 208: L77, Bibcode:1976ApJ...208L..77E, doi:10.1086/182236, hdl:11858/00-001M-0000-0013-5EC4-8.
See Buchert & Ehlers 1993, Buchert & Ehlers 1997a and Buchert & Ehlers 1997b. The current status of Buchert's further work is summarized in Buchert 2008. Buchert, Thomas; Ehlers, Jürgen (1993), "Lagrangian theory of gravitational instability of Friedmann-Lemaître cosmologies – second-order approach: an improved model for nonlinear clustering", Mon. Not. R. Astron. Soc., 264 (2): 375–387, Bibcode:1993MNRAS.264..375B, doi:10.1093/mnras/264.2.375, hdl:11858/00-001M-0000-0013-5C2D-A Buchert, Thomas; Ehlers, Jürgen (1997a), "Averaging inhomogeneous Newtonian cosmologies", Astron. Astrophys., 320: 1–7, arXiv:astro-ph/9510056, Bibcode:1997A&A...320....1B Buchert, Thomas; Ehlers, Jürgen (1997b), "Newtonian cosmology in Lagrangian formulation: foundations and perturbation theory", General Relativity and Gravitation, 29 (6): 733–764, arXiv:astro-ph/9609036, Bibcode:1997GReGr..29..733E, doi:10.1023/A:1018885922682, S2CID 15670330 Buchert, Thomas (2008), "Dark Energy from Structure—A Status Report", General Relativity and Gravitation, 40 (2–3): 467–527, arXiv:0707.2153, Bibcode:2008GReGr..40..467B, doi:10.1007/s10714-007-0554-8, S2CID 17281664

harvard.edu

ui.adsabs.harvard.edu

The dissertation is Ehlers 1957; cf. Ellis 2009. Ehlers, Jürgen (1957), Konstruktionen und Charakterisierungen von Lösungen der Einsteinschen Gravitationsfeldgleichungen, University of Hamburg (dissertation, in German; title in English translation: Constructions and characterizations of solutions to Einstein's gravitational field equations) Ellis, George (2009), "Editorial note to: Pascual Jordan, Jürgen Ehlers, and Wolfgang Kundt, Exact solutions of the field equations of the general theory of relativity", General Relativity and Gravitation, 41 (9): 2170–2189, Bibcode:2009GReGr..41.2179E, doi:10.1007/s10714-009-0868-9
As described in Ellis & Krasiński 2007 and Sachs 2009. Ellis, George; Krasiński, Andrzej (2007), "Editors' comment", General Relativity and Gravitation, 39 (11): 1941–1942, Bibcode:2007GReGr..39.1929S, doi:10.1007/s10714-007-0448-9, hdl:11858/00-001M-0000-0013-47A1-D, S2CID 121554142, archived from the original on 3 March 2016, retrieved 8 July 2008 Sachs, Rainer (2009), "Some memories of Juergen", General Relativity and Gravitation, 41 (9): 1903–1904, Bibcode:2009GReGr..41.1903S, doi:10.1007/s10714-009-0784-z
Ellis 2009 Ellis, George (2009), "Editorial note to: Pascual Jordan, Jürgen Ehlers, and Wolfgang Kundt, Exact solutions of the field equations of the general theory of relativity", General Relativity and Gravitation, 41 (9): 2170–2189, Bibcode:2009GReGr..41.2179E, doi:10.1007/s10714-009-0868-9
Ellis 2009, p. 2180 Ellis, George (2009), "Editorial note to: Pascual Jordan, Jürgen Ehlers, and Wolfgang Kundt, Exact solutions of the field equations of the general theory of relativity", General Relativity and Gravitation, 41 (9): 2170–2189, Bibcode:2009GReGr..41.2179E, doi:10.1007/s10714-009-0868-9
Ehlers-Sachs theorem see sec. 5.3 in Frolov & Novikov 1998. An assessment of the work and its connection with Kerr solution is given by J. Bicak on p. 14f. of Schmidt 2000. The original work with Sachs is Jordan, Ehlers & Sachs 1961. Frolov, Valeri P.; Novikov, I. D. (1998), Black Hole Physics, Kluwer, ISBN 0-7923-5145-2 Schmidt, Bernd, ed. (2000), Einstein's Field Equations and their Physical Implications. Selected Essays in Honour of Jürgen Ehlers, Springer, ISBN 3-540-67073-4 Jordan, P.; Ehlers, J.; Sachs, R. K. (1961), "Beiträge zur Theorie der reinen Gravitationsstrahlung", Akad. Wiss. Lit. Mainz, Abh. Naturwiss. Kl., 1: 1, Bibcode:1961MAWMN...1....1J (in German, English translation of title: Contributions to the theory of pure gravitational radiation)
The English translation, by G. F. R. Ellis, is Ehlers 1993. The quotation can be found on p. 1225 in the editor's comments section. Ehlers, J. (1993), "Contributions to the relativistic mechanics of continuous media", Gen. Rel. Grav., 25 (12): 1225–1266, Bibcode:1993GReGr..25.1225E, doi:10.1007/BF00759031, hdl:11858/00-001M-0000-0013-5C1E-C, S2CID 122689869
Olive 1996 Olive, D. I. (1996), "Exact Electromagnetic Duality", Nucl. Phys. B Proc. Suppl., 45A (1): 88–102, arXiv:hep-th/9508089, Bibcode:1996NuPhS..45...88O, doi:10.1016/0920-5632(95)00618-4, S2CID 8584458
Maison op. cit., Geroch 1971, and, for various applications, Mars 2001. Geroch, R. (1971), "A method for generating new solutions of Einstein's field equation. I", J. Math. Phys., 12 (6): 918–924, Bibcode:1971JMP....12..918G, doi:10.1063/1.1665681 Mars, Marc (2001), "Space-time Ehlers group: Transformation law for the Weyl tensor", Class. Quantum Grav., 18 (4): 719–738, arXiv:gr-qc/0101020, Bibcode:2001CQGra..18..719M, doi:10.1088/0264-9381/18/4/311, S2CID 16943248
Hawking & Ellis 1973, p. 351ff. The original work is Ehlers, Geren & Sachs 1968. Hawking, Stephen W.; Ellis, George F. R. (1973), The large scale structure of space-time, Cambridge University Press, ISBN 0-521-09906-4 Ehlers, J.; Geren, P.; Sachs, R. K. (1968), "Isotropic solutions of Einstein-Liouville equations", J. Math. Phys., 9 (9): 1344–1349, Bibcode:1968JMP.....9.1344E, doi:10.1063/1.1664720, hdl:11858/00-001M-0000-0013-5EFE-8
See Köhler & Schattner 1979. The original publication is Ehlers & Rudolph 1977. Köhler, Egon; Schattner, Ruprecht (1979), "Some results on pseudorigid motions", General Relativity and Gravitation, 10 (8): 709–716, Bibcode:1979GReGr..10..709K, doi:10.1007/BF00756906, S2CID 121458325 Ehlers, Jürgen; Rudolph, Ekkart (1977), "Dynamics of extended bodies in general relativity center-of-mass description and quasirigidity", General Relativity and Gravitation, 8 (3): 197–217, Bibcode:1977GReGr...8..197E, doi:10.1007/BF00763547, hdl:11858/00-001M-0000-0013-5EBF-5, S2CID 59429452, archived from the original on 28 September 2019, retrieved 13 July 2019.
A review of the book itself is Bleyer 1993. The long-term impact can be judged by the way it is held up as a reference in the reviews of later books on the same topic, e.g. Perlick 2005 and Bozza 2005; see also the assessment of Trümper 2009, p. 154. Bleyer, U. (1993), "Book-Review - Gravitational Lenses", Astronomische Nachrichten, 314 (4): 314–315, Bibcode:1993AN....314..314S, doi:10.1002/asna.2113140412 Perlick, Volker (2005), "Book review:Petters, A.O., Levine, H., Wambsganss, J.: Singularity theory and gravitational lensing", Gen. Relativ. Gravit., 37 (2): 435–436, Bibcode:2005GReGr..37..435P, doi:10.1007/s10714-005-0033-z, S2CID 122607061 Bozza, Valerio (2005), "Book review: Silvia Mollerach, Esteban Roulet: Gravitational Lensing and Microlensing", General Relativity and Gravitation, 37 (7): 1335–1336, Bibcode:2005GReGr..37.1335B, doi:10.1007/s10714-005-0117-9, S2CID 120764050 Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154
Seitz, Schneider & Ehlers 1994, cf. section 3.5 of Annual Report 1994, Max Planck Institute for Astrophysics, 1995, archived from the original on 19 May 2009 Seitz, S.; Schneider, P.; Ehlers, J. (1994), "Light propagation in arbitrary spacetimes and the gravitational lens approximation", Class. Quantum Grav., 11 (9): 2345–2383, arXiv:astro-ph/9403056, Bibcode:1994CQGra..11.2345S, doi:10.1088/0264-9381/11/9/016, S2CID 18176981
Ehlers 1997; a description can be found on p. 216f. in Luc Blanchet's contribution "Post-Newtonian Gravitational Radiation", pp. 225–271 in Schmidt 2000. Ehlers, Jürgen (January 1997), "Examples of Newtonian limits of relativistic spacetimes" (PDF), Classical and Quantum Gravity, 14 (1A): A119–A126, Bibcode:1997CQGra..14A.119E, doi:10.1088/0264-9381/14/1A/010, hdl:11858/00-001M-0000-0013-5AC5-F, S2CID 250804865 Schmidt, Bernd, ed. (2000), Einstein's Field Equations and their Physical Implications. Selected Essays in Honour of Jürgen Ehlers, Springer, ISBN 3-540-67073-4
Oliynyk & Schmidt 2009 Oliynyk, Todd Andrew; Schmidt, Bernd (2009), "Existence of families of spacetimes with a Newtonian limit", General Relativity and Gravitation, 41 (9): 2093–2111, arXiv:0908.2832, Bibcode:2009GReGr..41.2093O, doi:10.1007/s10714-009-0843-5, S2CID 12396713
A description that includes the historical context can be found in Schutz 1996. The original work is Ehlers et al. 1976. Schutz, B. F. (1996), "Making the Transition from Newton to Einstein: Chandrasekhar's Work on the Post-Newtonian Approximation and Radiation Reaction" (PDF), J. Astrophys. Astron., 17 (3–4): 183–197, Bibcode:1996JApA...17..183S, doi:10.1007/BF02702303, hdl:11858/00-001M-0000-0013-7535-E, S2CID 73579437 Ehlers, J.; Rosenblum, A.; Goldberg, J. N.; Havas, Peter (1976), "Comments on gravitational radiation damping and energy loss in binary systems", Astrophys. J., 208: L77, Bibcode:1976ApJ...208L..77E, doi:10.1086/182236, hdl:11858/00-001M-0000-0013-5EC4-8.
See Buchert & Ehlers 1993, Buchert & Ehlers 1997a and Buchert & Ehlers 1997b. The current status of Buchert's further work is summarized in Buchert 2008. Buchert, Thomas; Ehlers, Jürgen (1993), "Lagrangian theory of gravitational instability of Friedmann-Lemaître cosmologies – second-order approach: an improved model for nonlinear clustering", Mon. Not. R. Astron. Soc., 264 (2): 375–387, Bibcode:1993MNRAS.264..375B, doi:10.1093/mnras/264.2.375, hdl:11858/00-001M-0000-0013-5C2D-A Buchert, Thomas; Ehlers, Jürgen (1997a), "Averaging inhomogeneous Newtonian cosmologies", Astron. Astrophys., 320: 1–7, arXiv:astro-ph/9510056, Bibcode:1997A&A...320....1B Buchert, Thomas; Ehlers, Jürgen (1997b), "Newtonian cosmology in Lagrangian formulation: foundations and perturbation theory", General Relativity and Gravitation, 29 (6): 733–764, arXiv:astro-ph/9609036, Bibcode:1997GReGr..29..733E, doi:10.1023/A:1018885922682, S2CID 15670330 Buchert, Thomas (2008), "Dark Energy from Structure—A Status Report", General Relativity and Gravitation, 40 (2–3): 467–527, arXiv:0707.2153, Bibcode:2008GReGr..40..467B, doi:10.1007/s10714-007-0554-8, S2CID 17281664
See Ehlers 2006a and Breuer & Springer 2001 as well as its later English translation Breuer & Springer 2009, as well as Ehlers 2005. Ehlers, Jürgen (2006a), "Physikalische Erkenntnis, dargestellt am Beispiel des Übergangs von Newtons Raumzeit zu Einsteins spezieller Relativitätstheorie", in Balsinger, Philipp W.; Kötter, Rudolf (eds.), Die Kultur moderner Wissenschaft am Beispiel Albert Einstein, Elsevier/Spektrum Akademie Verlag, pp. 1–16, archived from the original on 24 March 2018, retrieved 8 July 2008 (in German, English translation of title: Gaining knowledge in physics, shown for the example of the transition from Newton's spacetime to Einstein's special theory of relativity) Breuer, Reinhard; Springer, Michael (2001), "Die Wahrheit in der Wissenschaft", Spektrum der Wissenschaft, 7: 70 (in German) Breuer, Reinhard; Springer, Michael (2009), "The truth in science", General Relativity and Gravitation, 41 (9): 2159–2167, Bibcode:2009GReGr..41.2159B, doi:10.1007/s10714-009-0844-4, S2CID 123226152 Ehlers, Jürgen (2005), "Modelle in der Physik", Modelle des Denkens, Berlin-Brandenburgische Akademie der Wissenschaften, pp. 35–40 (in German, English translation of contribution title: Models in physics; English translation of title: Models of thinking)
Nicolai, Ellis & Schmidt 2009 Nicolai, Hermann; Ellis, George; Schmidt, Bernd (2009), "Editorial", General Relativity and Gravitation, 41 (9): 1897, Bibcode:2009GReGr..41.1897., doi:10.1007/s10714-009-0867-x

ias.ac.in

A description that includes the historical context can be found in Schutz 1996. The original work is Ehlers et al. 1976. Schutz, B. F. (1996), "Making the Transition from Newton to Einstein: Chandrasekhar's Work on the Post-Newtonian Approximation and Radiation Reaction" (PDF), J. Astrophys. Astron., 17 (3–4): 183–197, Bibcode:1996JApA...17..183S, doi:10.1007/BF02702303, hdl:11858/00-001M-0000-0013-7535-E, S2CID 73579437 Ehlers, J.; Rosenblum, A.; Goldberg, J. N.; Havas, Peter (1976), "Comments on gravitational radiation damping and energy loss in binary systems", Astrophys. J., 208: L77, Bibcode:1976ApJ...208L..77E, doi:10.1086/182236, hdl:11858/00-001M-0000-0013-5EC4-8.

isgrg.org

GRG Society History, International Society on General Relativity and Gravitation, retrieved 28 May 2013.
The Jürgen Ehlers Thesis Prize, Website of the International Society on General Relativity and Gravitation, retrieved 28 May 2013

leopoldina.org

Berlin: Huisken, Nicolai & Schutz 2009; initial membership date in brief note on p.35 of the same publication. Mainz: p. 13 of Lütjen-Drecoll 2008. Leopoldina: listed as member on Mitgliederverzeichnis, Deutsche Akademie der Naturforscher Leopoldina, retrieved 28 May 2012 (in German, English translation of title: Members list). Bavarian Academy: Trümper 2009. Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Lütjen-Drecoll, Elke, ed. (2008), Newsletter 1/08 (PDF), Akademie der Wissenschaften und der Literatur Mainz^{[permanent dead link]} (in German) Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154

maerkischeallgemeine.de

See p. 520 in the Max Planck Society's annual report for 2000, Jahrbuch 2000, Max-Planck-Gesellschaft, 2000. Time as emeritus and death cf. Braun 2008. Braun, Rüdiger (27 May 2008), "Wo Zeit und Raum aufhören. Der Mitbegründer des Golmer Max-Planck-Instituts für Gravitationsphysik, Jürgen Ehlers, ist unerwartet verstorben", Märkische Allgemeine Zeitung, retrieved 28 May 2013 (in German, English translation of title: Where time and space end. The co-founder of the Max Planck Institute for Gravitational Physics, Jürgen Ehlers, has died unexpectedly)
Cf. Braun 2008. Details about the project can be found on its website. Braun, Rüdiger (27 May 2008), "Wo Zeit und Raum aufhören. Der Mitbegründer des Golmer Max-Planck-Instituts für Gravitationsphysik, Jürgen Ehlers, ist unerwartet verstorben", Märkische Allgemeine Zeitung, retrieved 28 May 2013 (in German, English translation of title: Where time and space end. The co-founder of the Max Planck Institute for Gravitational Physics, Jürgen Ehlers, has died unexpectedly)
Max Planck Medal: Press release about the 2002 awards, Physikalische Spitzenleistung, Deutsche Physikalische Gesellschaft, 17 December 2001, archived from the original on 13 February 2007, retrieved 27 May 2008 (in German, English translation of title: Top achievement in physics), and Rogalla 2001. Volta Medal: "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, 18 May 2005, retrieved 27 May 2008 (in German) and "Medaille für Golmer Forscher", Märkische Allgemeine Zeitung, 19 May 2005 (in German, English translation of title: Medal for researcher from Golm). Charles University Medal: Trümper 2009, p. 154. Rogalla, Thomas (28 December 2001), "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, retrieved 28 May 2013 (in German) Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154

mpg.de

aei.mpg.de

Huisken, Nicolai & Schutz 2009, cf. the English version online as Huisken, Nicolai & Schutz 2008, and the associated CV, Lebenslauf von Prof. Dr. Jürgen Ehlers (PDF), Max Planck Institute for Gravitational Physics, 27 May 2008, archived from the original (PDF) on 19 May 2009, retrieved 27 May 2008 (in German, English translation of title: "CV for Prof. Dr. Jürgen Ehlers"). Dates and positions also summarized in Weber & Borissoff 1998. Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2008), Obituary: Jürgen Ehlers (PDF), Max Planck Institute for Gravitational Physics, archived from the original (PDF) on 11 May 2011 Weber, Peter; Borissoff, Irene, eds. (1998), Handbuch der Wissenschaftlichen Mitglieder, Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., p. 38 (in German, English translation of title: Handbook of Scientific Members).
Huisken, Nicolai & Schutz 2009; English version online as Huisken, Nicolai & Schutz 2008 Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2008), Obituary: Jürgen Ehlers (PDF), Max Planck Institute for Gravitational Physics, archived from the original (PDF) on 11 May 2011
Schücking 2000 Schücking, Engelbert (2000), "Jürgen Ehlers:Work and Style", Annual Report 2000 (PDF), Max Planck Institute for Gravitational Physics, pp. 46–47, archived from the original (PDF) on 11 June 2007
Public lectures: Biennial Report 2004/2005 (PDF), Max Planck Institute for Gravitational Physics, 2006, archived from the original (PDF) on 11 June 2007, lists 25 popular talks (p. 158f.) for that time-frame alone. The compilation of articles is Börner & Ehlers 1996, listed under Selected Publications. An example for a popular article is Ehlers & Fahr 1994. Ehlers, J.; Fahr, H. J. (1994), "Urknall oder Ewigkeit", Bild der Wissenschaft, June: 84
Biennial Report 2004/2005 (PDF), Max Planck Institute for Gravitational Physics, 2006, archived from the original (PDF) on 11 June 2007 lists 11 talks to teachers or in an interdisciplinary setting (p. 147f., p. 154f.). Mathematics and physics Ehlers 2006b Ehlers, Jürgen (2006b), "Mathematik als "Sprache" der Physik", Praxis der Naturwissenschaften – Physik in der Schule, 55, archived from the original on 20 April 2017, retrieved 8 July 2008 (in German, English translation of title: Mathematics as the "language" of physics)

edoc.mpg.de

As described in Ellis & Krasiński 2007 and Sachs 2009. Ellis, George; Krasiński, Andrzej (2007), "Editors' comment", General Relativity and Gravitation, 39 (11): 1941–1942, Bibcode:2007GReGr..39.1929S, doi:10.1007/s10714-007-0448-9, hdl:11858/00-001M-0000-0013-47A1-D, S2CID 121554142, archived from the original on 3 March 2016, retrieved 8 July 2008 Sachs, Rainer (2009), "Some memories of Juergen", General Relativity and Gravitation, 41 (9): 1903–1904, Bibcode:2009GReGr..41.1903S, doi:10.1007/s10714-009-0784-z
See Köhler & Schattner 1979. The original publication is Ehlers & Rudolph 1977. Köhler, Egon; Schattner, Ruprecht (1979), "Some results on pseudorigid motions", General Relativity and Gravitation, 10 (8): 709–716, Bibcode:1979GReGr..10..709K, doi:10.1007/BF00756906, S2CID 121458325 Ehlers, Jürgen; Rudolph, Ekkart (1977), "Dynamics of extended bodies in general relativity center-of-mass description and quasirigidity", General Relativity and Gravitation, 8 (3): 197–217, Bibcode:1977GReGr...8..197E, doi:10.1007/BF00763547, hdl:11858/00-001M-0000-0013-5EBF-5, S2CID 59429452, archived from the original on 28 September 2019, retrieved 13 July 2019.
See Ehlers 2006a and Breuer & Springer 2001 as well as its later English translation Breuer & Springer 2009, as well as Ehlers 2005. Ehlers, Jürgen (2006a), "Physikalische Erkenntnis, dargestellt am Beispiel des Übergangs von Newtons Raumzeit zu Einsteins spezieller Relativitätstheorie", in Balsinger, Philipp W.; Kötter, Rudolf (eds.), Die Kultur moderner Wissenschaft am Beispiel Albert Einstein, Elsevier/Spektrum Akademie Verlag, pp. 1–16, archived from the original on 24 March 2018, retrieved 8 July 2008 (in German, English translation of title: Gaining knowledge in physics, shown for the example of the transition from Newton's spacetime to Einstein's special theory of relativity) Breuer, Reinhard; Springer, Michael (2001), "Die Wahrheit in der Wissenschaft", Spektrum der Wissenschaft, 7: 70 (in German) Breuer, Reinhard; Springer, Michael (2009), "The truth in science", General Relativity and Gravitation, 41 (9): 2159–2167, Bibcode:2009GReGr..41.2159B, doi:10.1007/s10714-009-0844-4, S2CID 123226152 Ehlers, Jürgen (2005), "Modelle in der Physik", Modelle des Denkens, Berlin-Brandenburgische Akademie der Wissenschaften, pp. 35–40 (in German, English translation of contribution title: Models in physics; English translation of title: Models of thinking)
Biennial Report 2004/2005 (PDF), Max Planck Institute for Gravitational Physics, 2006, archived from the original (PDF) on 11 June 2007 lists 11 talks to teachers or in an interdisciplinary setting (p. 147f., p. 154f.). Mathematics and physics Ehlers 2006b Ehlers, Jürgen (2006b), "Mathematik als "Sprache" der Physik", Praxis der Naturwissenschaften – Physik in der Schule, 55, archived from the original on 20 April 2017, retrieved 8 July 2008 (in German, English translation of title: Mathematics as the "language" of physics)

mpg.de

See p. 520 in the Max Planck Society's annual report for 2000, Jahrbuch 2000, Max-Planck-Gesellschaft, 2000. Time as emeritus and death cf. Braun 2008. Braun, Rüdiger (27 May 2008), "Wo Zeit und Raum aufhören. Der Mitbegründer des Golmer Max-Planck-Instituts für Gravitationsphysik, Jürgen Ehlers, ist unerwartet verstorben", Märkische Allgemeine Zeitung, retrieved 28 May 2013 (in German, English translation of title: Where time and space end. The co-founder of the Max Planck Institute for Gravitational Physics, Jürgen Ehlers, has died unexpectedly)

mpa-garching.mpg.de

Seitz, Schneider & Ehlers 1994, cf. section 3.5 of Annual Report 1994, Max Planck Institute for Astrophysics, 1995, archived from the original on 19 May 2009 Seitz, S.; Schneider, P.; Ehlers, J. (1994), "Light propagation in arbitrary spacetimes and the gravitational lens approximation", Class. Quantum Grav., 11 (9): 2345–2383, arXiv:astro-ph/9403056, Bibcode:1994CQGra..11.2345S, doi:10.1088/0264-9381/11/9/016, S2CID 18176981

pubman.mpdl.mpg.de

Ehlers 1997; a description can be found on p. 216f. in Luc Blanchet's contribution "Post-Newtonian Gravitational Radiation", pp. 225–271 in Schmidt 2000. Ehlers, Jürgen (January 1997), "Examples of Newtonian limits of relativistic spacetimes" (PDF), Classical and Quantum Gravity, 14 (1A): A119–A126, Bibcode:1997CQGra..14A.119E, doi:10.1088/0264-9381/14/1A/010, hdl:11858/00-001M-0000-0013-5AC5-F, S2CID 250804865 Schmidt, Bernd, ed. (2000), Einstein's Field Equations and their Physical Implications. Selected Essays in Honour of Jürgen Ehlers, Springer, ISBN 3-540-67073-4

quantum-history.mpiwg-berlin.mpg.de

Cf. Braun 2008. Details about the project can be found on its website. Braun, Rüdiger (27 May 2008), "Wo Zeit und Raum aufhören. Der Mitbegründer des Golmer Max-Planck-Instituts für Gravitationsphysik, Jürgen Ehlers, ist unerwartet verstorben", Märkische Allgemeine Zeitung, retrieved 28 May 2013 (in German, English translation of title: Where time and space end. The co-founder of the Max Planck Institute for Gravitational Physics, Jürgen Ehlers, has died unexpectedly)

semanticscholar.org

api.semanticscholar.org

As described in Ellis & Krasiński 2007 and Sachs 2009. Ellis, George; Krasiński, Andrzej (2007), "Editors' comment", General Relativity and Gravitation, 39 (11): 1941–1942, Bibcode:2007GReGr..39.1929S, doi:10.1007/s10714-007-0448-9, hdl:11858/00-001M-0000-0013-47A1-D, S2CID 121554142, archived from the original on 3 March 2016, retrieved 8 July 2008 Sachs, Rainer (2009), "Some memories of Juergen", General Relativity and Gravitation, 41 (9): 1903–1904, Bibcode:2009GReGr..41.1903S, doi:10.1007/s10714-009-0784-z
The English translation, by G. F. R. Ellis, is Ehlers 1993. The quotation can be found on p. 1225 in the editor's comments section. Ehlers, J. (1993), "Contributions to the relativistic mechanics of continuous media", Gen. Rel. Grav., 25 (12): 1225–1266, Bibcode:1993GReGr..25.1225E, doi:10.1007/BF00759031, hdl:11858/00-001M-0000-0013-5C1E-C, S2CID 122689869
Olive 1996 Olive, D. I. (1996), "Exact Electromagnetic Duality", Nucl. Phys. B Proc. Suppl., 45A (1): 88–102, arXiv:hep-th/9508089, Bibcode:1996NuPhS..45...88O, doi:10.1016/0920-5632(95)00618-4, S2CID 8584458
Maison op. cit., Geroch 1971, and, for various applications, Mars 2001. Geroch, R. (1971), "A method for generating new solutions of Einstein's field equation. I", J. Math. Phys., 12 (6): 918–924, Bibcode:1971JMP....12..918G, doi:10.1063/1.1665681 Mars, Marc (2001), "Space-time Ehlers group: Transformation law for the Weyl tensor", Class. Quantum Grav., 18 (4): 719–738, arXiv:gr-qc/0101020, Bibcode:2001CQGra..18..719M, doi:10.1088/0264-9381/18/4/311, S2CID 16943248
See Köhler & Schattner 1979. The original publication is Ehlers & Rudolph 1977. Köhler, Egon; Schattner, Ruprecht (1979), "Some results on pseudorigid motions", General Relativity and Gravitation, 10 (8): 709–716, Bibcode:1979GReGr..10..709K, doi:10.1007/BF00756906, S2CID 121458325 Ehlers, Jürgen; Rudolph, Ekkart (1977), "Dynamics of extended bodies in general relativity center-of-mass description and quasirigidity", General Relativity and Gravitation, 8 (3): 197–217, Bibcode:1977GReGr...8..197E, doi:10.1007/BF00763547, hdl:11858/00-001M-0000-0013-5EBF-5, S2CID 59429452, archived from the original on 28 September 2019, retrieved 13 July 2019.
A review of the book itself is Bleyer 1993. The long-term impact can be judged by the way it is held up as a reference in the reviews of later books on the same topic, e.g. Perlick 2005 and Bozza 2005; see also the assessment of Trümper 2009, p. 154. Bleyer, U. (1993), "Book-Review - Gravitational Lenses", Astronomische Nachrichten, 314 (4): 314–315, Bibcode:1993AN....314..314S, doi:10.1002/asna.2113140412 Perlick, Volker (2005), "Book review:Petters, A.O., Levine, H., Wambsganss, J.: Singularity theory and gravitational lensing", Gen. Relativ. Gravit., 37 (2): 435–436, Bibcode:2005GReGr..37..435P, doi:10.1007/s10714-005-0033-z, S2CID 122607061 Bozza, Valerio (2005), "Book review: Silvia Mollerach, Esteban Roulet: Gravitational Lensing and Microlensing", General Relativity and Gravitation, 37 (7): 1335–1336, Bibcode:2005GReGr..37.1335B, doi:10.1007/s10714-005-0117-9, S2CID 120764050 Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154
Seitz, Schneider & Ehlers 1994, cf. section 3.5 of Annual Report 1994, Max Planck Institute for Astrophysics, 1995, archived from the original on 19 May 2009 Seitz, S.; Schneider, P.; Ehlers, J. (1994), "Light propagation in arbitrary spacetimes and the gravitational lens approximation", Class. Quantum Grav., 11 (9): 2345–2383, arXiv:astro-ph/9403056, Bibcode:1994CQGra..11.2345S, doi:10.1088/0264-9381/11/9/016, S2CID 18176981
Ehlers 1997; a description can be found on p. 216f. in Luc Blanchet's contribution "Post-Newtonian Gravitational Radiation", pp. 225–271 in Schmidt 2000. Ehlers, Jürgen (January 1997), "Examples of Newtonian limits of relativistic spacetimes" (PDF), Classical and Quantum Gravity, 14 (1A): A119–A126, Bibcode:1997CQGra..14A.119E, doi:10.1088/0264-9381/14/1A/010, hdl:11858/00-001M-0000-0013-5AC5-F, S2CID 250804865 Schmidt, Bernd, ed. (2000), Einstein's Field Equations and their Physical Implications. Selected Essays in Honour of Jürgen Ehlers, Springer, ISBN 3-540-67073-4
Oliynyk & Schmidt 2009 Oliynyk, Todd Andrew; Schmidt, Bernd (2009), "Existence of families of spacetimes with a Newtonian limit", General Relativity and Gravitation, 41 (9): 2093–2111, arXiv:0908.2832, Bibcode:2009GReGr..41.2093O, doi:10.1007/s10714-009-0843-5, S2CID 12396713
A description that includes the historical context can be found in Schutz 1996. The original work is Ehlers et al. 1976. Schutz, B. F. (1996), "Making the Transition from Newton to Einstein: Chandrasekhar's Work on the Post-Newtonian Approximation and Radiation Reaction" (PDF), J. Astrophys. Astron., 17 (3–4): 183–197, Bibcode:1996JApA...17..183S, doi:10.1007/BF02702303, hdl:11858/00-001M-0000-0013-7535-E, S2CID 73579437 Ehlers, J.; Rosenblum, A.; Goldberg, J. N.; Havas, Peter (1976), "Comments on gravitational radiation damping and energy loss in binary systems", Astrophys. J., 208: L77, Bibcode:1976ApJ...208L..77E, doi:10.1086/182236, hdl:11858/00-001M-0000-0013-5EC4-8.
See Buchert & Ehlers 1993, Buchert & Ehlers 1997a and Buchert & Ehlers 1997b. The current status of Buchert's further work is summarized in Buchert 2008. Buchert, Thomas; Ehlers, Jürgen (1993), "Lagrangian theory of gravitational instability of Friedmann-Lemaître cosmologies – second-order approach: an improved model for nonlinear clustering", Mon. Not. R. Astron. Soc., 264 (2): 375–387, Bibcode:1993MNRAS.264..375B, doi:10.1093/mnras/264.2.375, hdl:11858/00-001M-0000-0013-5C2D-A Buchert, Thomas; Ehlers, Jürgen (1997a), "Averaging inhomogeneous Newtonian cosmologies", Astron. Astrophys., 320: 1–7, arXiv:astro-ph/9510056, Bibcode:1997A&A...320....1B Buchert, Thomas; Ehlers, Jürgen (1997b), "Newtonian cosmology in Lagrangian formulation: foundations and perturbation theory", General Relativity and Gravitation, 29 (6): 733–764, arXiv:astro-ph/9609036, Bibcode:1997GReGr..29..733E, doi:10.1023/A:1018885922682, S2CID 15670330 Buchert, Thomas (2008), "Dark Energy from Structure—A Status Report", General Relativity and Gravitation, 40 (2–3): 467–527, arXiv:0707.2153, Bibcode:2008GReGr..40..467B, doi:10.1007/s10714-007-0554-8, S2CID 17281664
See Ehlers 2006a and Breuer & Springer 2001 as well as its later English translation Breuer & Springer 2009, as well as Ehlers 2005. Ehlers, Jürgen (2006a), "Physikalische Erkenntnis, dargestellt am Beispiel des Übergangs von Newtons Raumzeit zu Einsteins spezieller Relativitätstheorie", in Balsinger, Philipp W.; Kötter, Rudolf (eds.), Die Kultur moderner Wissenschaft am Beispiel Albert Einstein, Elsevier/Spektrum Akademie Verlag, pp. 1–16, archived from the original on 24 March 2018, retrieved 8 July 2008 (in German, English translation of title: Gaining knowledge in physics, shown for the example of the transition from Newton's spacetime to Einstein's special theory of relativity) Breuer, Reinhard; Springer, Michael (2001), "Die Wahrheit in der Wissenschaft", Spektrum der Wissenschaft, 7: 70 (in German) Breuer, Reinhard; Springer, Michael (2009), "The truth in science", General Relativity and Gravitation, 41 (9): 2159–2167, Bibcode:2009GReGr..41.2159B, doi:10.1007/s10714-009-0844-4, S2CID 123226152 Ehlers, Jürgen (2005), "Modelle in der Physik", Modelle des Denkens, Berlin-Brandenburgische Akademie der Wissenschaften, pp. 35–40 (in German, English translation of contribution title: Models in physics; English translation of title: Models of thinking)

spektrum.de

See Ehlers 2006a and Breuer & Springer 2001 as well as its later English translation Breuer & Springer 2009, as well as Ehlers 2005. Ehlers, Jürgen (2006a), "Physikalische Erkenntnis, dargestellt am Beispiel des Übergangs von Newtons Raumzeit zu Einsteins spezieller Relativitätstheorie", in Balsinger, Philipp W.; Kötter, Rudolf (eds.), Die Kultur moderner Wissenschaft am Beispiel Albert Einstein, Elsevier/Spektrum Akademie Verlag, pp. 1–16, archived from the original on 24 March 2018, retrieved 8 July 2008 (in German, English translation of title: Gaining knowledge in physics, shown for the example of the transition from Newton's spacetime to Einstein's special theory of relativity) Breuer, Reinhard; Springer, Michael (2001), "Die Wahrheit in der Wissenschaft", Spektrum der Wissenschaft, 7: 70 (in German) Breuer, Reinhard; Springer, Michael (2009), "The truth in science", General Relativity and Gravitation, 41 (9): 2159–2167, Bibcode:2009GReGr..41.2159B, doi:10.1007/s10714-009-0844-4, S2CID 123226152 Ehlers, Jürgen (2005), "Modelle in der Physik", Modelle des Denkens, Berlin-Brandenburgische Akademie der Wissenschaften, pp. 35–40 (in German, English translation of contribution title: Models in physics; English translation of title: Models of thinking)

web.archive.org

As described in Ellis & Krasiński 2007 and Sachs 2009. Ellis, George; Krasiński, Andrzej (2007), "Editors' comment", General Relativity and Gravitation, 39 (11): 1941–1942, Bibcode:2007GReGr..39.1929S, doi:10.1007/s10714-007-0448-9, hdl:11858/00-001M-0000-0013-47A1-D, S2CID 121554142, archived from the original on 3 March 2016, retrieved 8 July 2008 Sachs, Rainer (2009), "Some memories of Juergen", General Relativity and Gravitation, 41 (9): 1903–1904, Bibcode:2009GReGr..41.1903S, doi:10.1007/s10714-009-0784-z
Huisken, Nicolai & Schutz 2009, cf. the English version online as Huisken, Nicolai & Schutz 2008, and the associated CV, Lebenslauf von Prof. Dr. Jürgen Ehlers (PDF), Max Planck Institute for Gravitational Physics, 27 May 2008, archived from the original (PDF) on 19 May 2009, retrieved 27 May 2008 (in German, English translation of title: "CV for Prof. Dr. Jürgen Ehlers"). Dates and positions also summarized in Weber & Borissoff 1998. Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2008), Obituary: Jürgen Ehlers (PDF), Max Planck Institute for Gravitational Physics, archived from the original (PDF) on 11 May 2011 Weber, Peter; Borissoff, Irene, eds. (1998), Handbuch der Wissenschaftlichen Mitglieder, Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., p. 38 (in German, English translation of title: Handbook of Scientific Members).
As described in Breuer 2008 Breuer, Reinhard (26 May 2008), Jürgen Ehlers und die Relativitätstheorie, Spektrum der Wissenschaft Verlagsgesellschaft mbH, archived from the original on 28 September 2008 (in German, English translation of title Jürgen Ehlers and the Theory of Relativity)
Breuer 2008 Breuer, Reinhard (26 May 2008), Jürgen Ehlers und die Relativitätstheorie, Spektrum der Wissenschaft Verlagsgesellschaft mbH, archived from the original on 28 September 2008 (in German, English translation of title Jürgen Ehlers and the Theory of Relativity)
Huisken, Nicolai & Schutz 2009; English version online as Huisken, Nicolai & Schutz 2008 Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2009), "Zum Tod von Jürgen Ehlers", in Berlin-Brandenburgische Akademie der Wissenschaften (ed.), Jahrbuch 2008 (PDF), Oldenbourg, pp. 92–96 (in German) Huisken, Gerhard; Nicolai, Hermann; Schutz, Bernard (2008), Obituary: Jürgen Ehlers (PDF), Max Planck Institute for Gravitational Physics, archived from the original (PDF) on 11 May 2011
Schücking 2000 Schücking, Engelbert (2000), "Jürgen Ehlers:Work and Style", Annual Report 2000 (PDF), Max Planck Institute for Gravitational Physics, pp. 46–47, archived from the original (PDF) on 11 June 2007
See Köhler & Schattner 1979. The original publication is Ehlers & Rudolph 1977. Köhler, Egon; Schattner, Ruprecht (1979), "Some results on pseudorigid motions", General Relativity and Gravitation, 10 (8): 709–716, Bibcode:1979GReGr..10..709K, doi:10.1007/BF00756906, S2CID 121458325 Ehlers, Jürgen; Rudolph, Ekkart (1977), "Dynamics of extended bodies in general relativity center-of-mass description and quasirigidity", General Relativity and Gravitation, 8 (3): 197–217, Bibcode:1977GReGr...8..197E, doi:10.1007/BF00763547, hdl:11858/00-001M-0000-0013-5EBF-5, S2CID 59429452, archived from the original on 28 September 2019, retrieved 13 July 2019.
Seitz, Schneider & Ehlers 1994, cf. section 3.5 of Annual Report 1994, Max Planck Institute for Astrophysics, 1995, archived from the original on 19 May 2009 Seitz, S.; Schneider, P.; Ehlers, J. (1994), "Light propagation in arbitrary spacetimes and the gravitational lens approximation", Class. Quantum Grav., 11 (9): 2345–2383, arXiv:astro-ph/9403056, Bibcode:1994CQGra..11.2345S, doi:10.1088/0264-9381/11/9/016, S2CID 18176981
See Ehlers 2006a and Breuer & Springer 2001 as well as its later English translation Breuer & Springer 2009, as well as Ehlers 2005. Ehlers, Jürgen (2006a), "Physikalische Erkenntnis, dargestellt am Beispiel des Übergangs von Newtons Raumzeit zu Einsteins spezieller Relativitätstheorie", in Balsinger, Philipp W.; Kötter, Rudolf (eds.), Die Kultur moderner Wissenschaft am Beispiel Albert Einstein, Elsevier/Spektrum Akademie Verlag, pp. 1–16, archived from the original on 24 March 2018, retrieved 8 July 2008 (in German, English translation of title: Gaining knowledge in physics, shown for the example of the transition from Newton's spacetime to Einstein's special theory of relativity) Breuer, Reinhard; Springer, Michael (2001), "Die Wahrheit in der Wissenschaft", Spektrum der Wissenschaft, 7: 70 (in German) Breuer, Reinhard; Springer, Michael (2009), "The truth in science", General Relativity and Gravitation, 41 (9): 2159–2167, Bibcode:2009GReGr..41.2159B, doi:10.1007/s10714-009-0844-4, S2CID 123226152 Ehlers, Jürgen (2005), "Modelle in der Physik", Modelle des Denkens, Berlin-Brandenburgische Akademie der Wissenschaften, pp. 35–40 (in German, English translation of contribution title: Models in physics; English translation of title: Models of thinking)
Public lectures: Biennial Report 2004/2005 (PDF), Max Planck Institute for Gravitational Physics, 2006, archived from the original (PDF) on 11 June 2007, lists 25 popular talks (p. 158f.) for that time-frame alone. The compilation of articles is Börner & Ehlers 1996, listed under Selected Publications. An example for a popular article is Ehlers & Fahr 1994. Ehlers, J.; Fahr, H. J. (1994), "Urknall oder Ewigkeit", Bild der Wissenschaft, June: 84
Biennial Report 2004/2005 (PDF), Max Planck Institute for Gravitational Physics, 2006, archived from the original (PDF) on 11 June 2007 lists 11 talks to teachers or in an interdisciplinary setting (p. 147f., p. 154f.). Mathematics and physics Ehlers 2006b Ehlers, Jürgen (2006b), "Mathematik als "Sprache" der Physik", Praxis der Naturwissenschaften – Physik in der Schule, 55, archived from the original on 20 April 2017, retrieved 8 July 2008 (in German, English translation of title: Mathematics as the "language" of physics)
Max Planck Medal: Press release about the 2002 awards, Physikalische Spitzenleistung, Deutsche Physikalische Gesellschaft, 17 December 2001, archived from the original on 13 February 2007, retrieved 27 May 2008 (in German, English translation of title: Top achievement in physics), and Rogalla 2001. Volta Medal: "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, 18 May 2005, retrieved 27 May 2008 (in German) and "Medaille für Golmer Forscher", Märkische Allgemeine Zeitung, 19 May 2005 (in German, English translation of title: Medal for researcher from Golm). Charles University Medal: Trümper 2009, p. 154. Rogalla, Thomas (28 December 2001), "Namen: Prof. Dr. Jürgen Ehlers", Berliner Zeitung, retrieved 28 May 2013 (in German) Trümper, Joachim (2009), "Nachruf auf Jürgen Ehlers", Jahrbuch der Bayerischen Akademie der Wissenschaften 2008 (PDF), pp. 152–154

wissenslogs.de

As described in Breuer 2008 Breuer, Reinhard (26 May 2008), Jürgen Ehlers und die Relativitätstheorie, Spektrum der Wissenschaft Verlagsgesellschaft mbH, archived from the original on 28 September 2008 (in German, English translation of title Jürgen Ehlers and the Theory of Relativity)
Breuer 2008 Breuer, Reinhard (26 May 2008), Jürgen Ehlers und die Relativitätstheorie, Spektrum der Wissenschaft Verlagsgesellschaft mbH, archived from the original on 28 September 2008 (in German, English translation of title Jürgen Ehlers and the Theory of Relativity)