Clifton–Pohl torus (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Clifton–Pohl torus" in English language version.

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2books.google.com

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ams.org

mathscinet.ams.org

Wolf, Joseph A. (2011), Spaces of constant curvature (6th ed.), AMS Chelsea Publishing, Providence, RI, p. 95, ISBN 978-0-8218-5282-8, MR 2742530.

books.google.com

O'Neill, Barrett (1983), Semi-Riemannian Geometry With Applications to Relativity, Pure and Applied Mathematics, vol. 103, Academic Press, p. 193, ISBN 9780080570570.
Wolf, Joseph A. (2011), Spaces of constant curvature (6th ed.), AMS Chelsea Publishing, Providence, RI, p. 95, ISBN 978-0-8218-5282-8, MR 2742530.

doi.org

Bavard, Ch.; Mounoud, P. (2013), "Surfaces lorentziennes sans points conjugués", Geometry and Topology, 17: 469–492, doi:10.2140/gt.2013.17.469
Hopf, E. (1948), "Closed surfaces without conjugate points", Proc. Natl. Acad. Sci. U.S.A., 34 (2): 47–51, Bibcode:1948PNAS...34...47H, doi:10.1073/pnas.34.2.47, PMC 1062913, PMID 16588785

harvard.edu

ui.adsabs.harvard.edu

Hopf, E. (1948), "Closed surfaces without conjugate points", Proc. Natl. Acad. Sci. U.S.A., 34 (2): 47–51, Bibcode:1948PNAS...34...47H, doi:10.1073/pnas.34.2.47, PMC 1062913, PMID 16588785

nih.gov

ncbi.nlm.nih.gov

Hopf, E. (1948), "Closed surfaces without conjugate points", Proc. Natl. Acad. Sci. U.S.A., 34 (2): 47–51, Bibcode:1948PNAS...34...47H, doi:10.1073/pnas.34.2.47, PMC 1062913, PMID 16588785

pubmed.ncbi.nlm.nih.gov

Hopf, E. (1948), "Closed surfaces without conjugate points", Proc. Natl. Acad. Sci. U.S.A., 34 (2): 47–51, Bibcode:1948PNAS...34...47H, doi:10.1073/pnas.34.2.47, PMC 1062913, PMID 16588785