Helium (Danish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Helium" in Danish language version.

refsWebsite

Global rank Danish rank

27doi.org

2^nd place

13^th place

19web.archive.org

1^st place

6nih.gov

4^th place

24^th place

2archive.org

6^th place

12^th place

2lanl.gov

3,495^th place

4,593^rd place

2rubicon-foundation.org

low place

4,714^th place

2nasa.gov

75^th place

113^th place

1sciencemag.org

857^th place

389^th place

1lenntech.com

low place

1yutopian.com

low place

1wesleyan.edu

7,995^th place

low place

1worldcat.org

5^th place

36^th place

1cern.ch

1,959^th place

1,658^th place

1unsw.edu.au

4,584^th place

4,645^th place

1anb.org

3,441^st place

low place

1leidenuniv.nl

4,798^th place

8,287^th place

1nature.com

234^th place

176^th place

1google.co.uk

504^th place

219^th place

1acs.org

1,248^th place

1,899^th place

1archive.today

14^th place

37^th place

1jstor.org

26^th place

145^th place

1nationalacademies.org

7,189^th place

low place

1nap.edu

2,128^th place

2,703^rd place

1airproducts.com

low place

1einstein-online.info

low place

1weather.gov

1,128^th place

5,036^th place

1astronomynotes.com

low place

1livescience.com

1,190^th place

224^th place

1webelements.com

3,527^th place

7,292^nd place

1cam.ac.uk

670^th place

1,062^nd place

1mantleplumes.org

low place

1environmentalchemistry.com

low place

9,622^nd place

1ingentaconnect.com

3,306^th place

3,646^th place

1wisc.edu

1,045^th place

1,687^th place

1usra.edu

2,838^th place

3,017^th place

1thespacereview.com

9,535^th place

low place

1scuba-doc.com

low place

1slate.com

259^th place

949^th place

acs.org

acswebcontent.acs.org

American Chemical Society (2004). "The Discovery of Helium in Natural Gas". Arkiveret fra originalen 20. maj 2006. Hentet 2006-05-17.

airproducts.com

DM Smith, TW Goodwin, J Schillinger (2003). "Challenges to the Worldwide Supply of Helium in the Next Decade" (PDF). Advances in Cryogenic Engineering. 49 A. Arkiveret fra originalen (PDF) 25. juni 2008. Hentet 6. juli 2008.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)

anb.org

Pat Munday (1999). Biographical entry for W.F. Hillebrand (1853–1925), geochemist and US Bureau of Standards administrator in American National Biography, ed. John A. Garraty and Mark C. Carnes, 24 vols. (Oxford University Press: 1999): v. 10, pp. 808–9; v. 11, pp. 227-8.

archive.org

Brandt, L. W. (1968). "Helium". I Clifford A. Hampel (red.). The Encyclopedia of the Chemical Elements. New York: Reinhold Book Corporation. s. 256–268. LCCN 68-29938.
H. P. Cady and D. F. McFarland (1906). "Helium in Natural Gas". Science. 14: 344. doi:10.1126/science.24.611.344. PMID 17772798.

archive.today

H. P. Cady and D. F. McFarland (1906). "Helium in Kansas Natural Gas". Transactions of the Kansas Academy of Science. 20: 80-81. doi:10.2307/3624645. Arkiveret fra originalen 27. maj 2012. Hentet 2008-07-23.

astronomynotes.com

Strobel, Nick (2007). "Nick Strobel's Astronomy Notes (chapter Atmospheres)". Hentet 2007-09-25.

cam.ac.uk

jbs.cam.ac.uk

Z. Cai, R. Clarke, N. Ward, W. J. Nuttall, B. A. Glowacki. "Modelling Helium Markets" (PDF). Arkiveret fra originalen (PDF) 25. juni 2008. Hentet 6. juli 2008. {{cite journal}}: Cite journal kræver |journal= (hjælp)CS1-vedligeholdelse: Flere navne: authors list (link)

cern.ch

visits.web.cern.ch

"CERN - LHC: Facts and Figures" (PDF). CERN. Arkiveret fra LHC Guide booklet originalen 6. juli 2011. Hentet 2008-04-30. {{cite web}}: Tjek |url= (hjælp)

doi.org

C. Malinowska-Adamska, P. Soma, J. Tomaszewski (2003). "Dynamic and thermodynamic properties of solid helium in the reduced all-neighbours approximation of the self-consistent phonon theory". physica status solidi (b). 240 (1): 55-67. doi:10.1002/pssb.200301871.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)
D. G. Henshaw (1958). "Structure of Solid Helium by Neutron Diffraction". Physical Review Letters. 109 (2): 328-330. doi:10.1103/PhysRev.109.328.
Fairbank H.A.; Lane C.T. (oktober 1949). "Rollin Film Rates in Liquid Helium". Physical Review. 76 (8): 1209-1211. doi:10.1103/PhysRev.76.1209.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)
B.V. Rollin and F. Simon (1949). "On the "film" phenomenon of liquid helium II". Physica. 6 (2): 219-230. doi:10.1016/S0031-8914(39)80013-1.
D. Bergman (oktober 1949). "Hydrodynamics and Third Sound in Thin He II Films". Physical Review. 188 (1): 370-384. doi:10.1103/PhysRev.188.370.
Butcher, Scott J.; Jones, Richard L.; Mayne, Jonathan R.; Hartley, Timothy C.; Petersen, Stewart R. (december 2007). "Impaired exercise ventilatory mechanics with the self-contained breathing apparatus are improved with heliox". European Journal of Applied Physiology. Netherlands: Springer. 101 (6): 659(11). doi:10.1007/s00421-007-0541-5.
I E Beckwith and C G Miller (1990). "Aerothermodynamics and Transition in High-Speed Wind Tunnels at Nasa Langley". Annual Review of Fluid Mechanics. 22: 419-439. doi:10.1146/annurev.fl.22.010190.002223.{{cite journal}}: CS1-vedligeholdelse: Bruger authors parameter (link)
H. Jakobsson (1997). "Simulations of the dynamics of the Large Earth-based Solar Telescope". Astronomical & Astrophysical Transactions. 13 (1): 35-46. doi:10.1080/10556799708208113.{{cite journal}}: CS1-vedligeholdelse: Bruger authors parameter (link)
William Ramsay (1895). "On a Gas Showing the Spectrum of Helium, the Reputed Cause of D3 , One of the Lines in the Coronal Spectrum. Preliminary Note". Proceedings of the Royal Society of London. 58: 65-67. doi:10.1098/rspl.1895.0006.
William Ramsay (1895). "Helium, a Gaseous Constituent of Certain Minerals. Part I". Proceedings of the Royal Society of London. 58: 80-89. doi:10.1098/rspl.1895.0010.
William Ramsay (1895). "Helium, a Gaseous Constituent of Certain Minerals. Part II--". Proceedings of the Royal Society of London. 59: 325-330. doi:10.1098/rspl.1895.0097.
Willem Hendrik Keesom (1926). "Solidification of Helium" ( (Webside ikke længere tilgængelig) – ^{Scholar search}). Nature. 118: 81. doi:10.1038/118081a0. Arkiveret (PDF) fra originalen 25. juni 2008. Hentet 2008-07-23. {{cite journal}}: Ekstern henvisning i |format= (hjælp)
P. Kapitza (1938). "Viscosity of Liquid Helium below the λ-Point". Nature. 141: 74. doi:10.1038/141074a0.
D. D. Osheroff, R. C. Richardson, and D. M. Lee (1972). "Evidence for a New Phase of Solid He³". Phys. Rev. Lett. 28 (14): 885-888. doi:10.1103/PhysRevLett.28.885.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)
H. P. Cady and D. F. McFarland (1906). "Helium in Natural Gas". Science. 14: 344. doi:10.1126/science.24.611.344. PMID 17772798.
H. P. Cady and D. F. McFarland (1906). "Helium in Kansas Natural Gas". Transactions of the Kansas Academy of Science. 20: 80-81. doi:10.2307/3624645. Arkiveret fra originalen 27. maj 2012. Hentet 2008-07-23.
Weiss, Achim. "Elements of the past: Big Bang Nucleosynthesis and observation". Max Planck Institute for Gravitational Physics. Arkiveret fra originalen 8. februar 2007. Hentet 2008-06-23.; Coc, A.; et al. (2004). "Updated Big Bang Nucleosynthesis confronted to WMAP observations and to the Abundance of Light Elements". Astrophysical Journal. 600: 544. doi:10.1086/380121. {{cite journal}}: Eksplicit brug af et al. i: |author= (hjælp)
Lie-Svendsen, Ø.; Rees, M. H. (1996). "Helium escape from the terrestrial atmosphere: The ion outflow mechanism". Journal of Geophysical Research. 101 (A2): 2435-2444. doi:10.1029/95JA02208.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)
Melvine A. Cook (1957). "Where is the Earth's Radiogenic Helium?". Nature. 179: 213. doi:10.1038/179213a0.
L. T. Aldrich and Alfred O. Nier (1948). "The Occurrence of He³ in Natural Sources of Helium". Phys. Rev. 74: 1590-1594. doi:10.1103/PhysRev.74.1590.
P. Morrison, J. Pine (1955). "Radiogenic Origin of the Helium Isotopes in Rock". Annals of the New York Academy of Sciences. 62 (3): 71-92. doi:10.1111/j.1749-6632.1955.tb35366.x.
V. P. Belyakov1, S. G. Durgar'yan, B. A. Mirzoyan, N. S. Nametkin1, O. G. Talakin and L. N. Chekalov (1981). "Membrane technology — A new trend in industrial gas separation". Chemical and Petroleum Engineering. 17 (1): 19-21. doi:10.1007/BF01245721.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)
Zastenker G.N.; Salerno E.; Buehler F.; Bochsler P.; Bassi M.; Agafonov Y.N.; Eismont N.A.; Khrapchenkov V.V.; Busemann H. (april 2002). "Isotopic Composition and Abundance of Interstellar Neutral Helium Based on Direct Measurements". Astrophysics. 45 (2): 131-142. doi:10.1023/A:1016057812964. Hentet 2007-01-05.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)
Hiby, Julius W. (1939). "Massenspektrographische Untersuchungen an Wasserstoff- und Heliumkanalstrahlen (H3+, H2-, HeH+, HeD+, He-)". Annalen der Physik. 426 (5): 473-487. doi:10.1002/andp.19394260506.
Ming Wah Wong (2000). "Prediction of a Metastable Helium Compound: HHeF". Journal of the American Chemical Society. 122 (26): 6289-6290. doi:10.1021/ja9938175.
Martin Saunders, Hugo A. Jiménez-Vázquez, R. James Cross, and Robert J. Poreda (1993). "Stable Compounds of Helium and Neon: He@C₆₀ and Ne@C₆₀". Science. 259 (5100): 1428-1430. doi:10.1126/science.259.5100.1428. PMID 17801275.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)
Saunders, M., Jiménez-Vázquez, H. A.; Cross, R. J.; Mroczkowski, S.; Freedberg, D. I.; Anet, F. A. L. (1994). "Probing the interior of fullerenes by ³He NMR spectroscopy of endohedral ³He@C₆₀ and ³He@C₇₀". Nature. 367: 256-258. doi:10.1038/367256a0.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)

einstein-online.info

Weiss, Achim. "Elements of the past: Big Bang Nucleosynthesis and observation". Max Planck Institute for Gravitational Physics. Arkiveret fra originalen 8. februar 2007. Hentet 2008-06-23.; Coc, A.; et al. (2004). "Updated Big Bang Nucleosynthesis confronted to WMAP observations and to the Abundance of Light Elements". Astrophysical Journal. 600: 544. doi:10.1086/380121. {{cite journal}}: Eksplicit brug af et al. i: |author= (hjælp)

environmentalchemistry.com

Periodic Table of Elements: Li – Lithium (EnvironmentalChemistry.com)

google.co.uk

scholar.google.co.uk

Willem Hendrik Keesom (1926). "Solidification of Helium" ( (Webside ikke længere tilgængelig) – ^{Scholar search}). Nature. 118: 81. doi:10.1038/118081a0. Arkiveret (PDF) fra originalen 25. juni 2008. Hentet 2008-07-23. {{cite journal}}: Ekstern henvisning i |format= (hjælp)

ingentaconnect.com

Zastenker G.N.; Salerno E.; Buehler F.; Bochsler P.; Bassi M.; Agafonov Y.N.; Eismont N.A.; Khrapchenkov V.V.; Busemann H. (april 2002). "Isotopic Composition and Abundance of Interstellar Neutral Helium Based on Direct Measurements". Astrophysics. 45 (2): 131-142. doi:10.1023/A:1016057812964. Hentet 2007-01-05.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)

jstor.org

mc1litvip.jstor.org

H. P. Cady and D. F. McFarland (1906). "Helium in Kansas Natural Gas". Transactions of the Kansas Academy of Science. 20: 80-81. doi:10.2307/3624645. Arkiveret fra originalen 27. maj 2012. Hentet 2008-07-23.

lanl.gov

periodic.lanl.gov

"Periodic Table: Helium". Los Alamos National Laboratory (LANL.gov):. Arkiveret fra originalen 2. juni 2008. Hentet 2008-07-23.{{cite web}}: CS1-vedligeholdelse: Ekstra punktum (link)
"Helium - Valency". Arkiveret fra originalen 2. juni 2008. Hentet 14. maj 2008.

leidenuniv.nl

www-lorentz.leidenuniv.nl

Dirk van Delft (2008). "Little cup of Helium, big Science" (PDF). Physics today. s. 36-42. Arkiveret fra originalen (PDF) 25. juni 2008. Hentet 2008-07-23.

lenntech.com

"Helium (He) and water". Lenntech. Hentet 2008-07-23. {{cite journal}}: Cite journal kræver |journal= (hjælp)

livescience.com

Helium Leaking from Earth in Southern California. Livescience

mantleplumes.org

Don L. Anderson, G. R. Foulger & Anders Meibom. "Helium Fundamentals". mantleplumes.org. Hentet 2008-07-23.

nap.edu

Executive Summary Arkiveret 2. maj 2005 hos Wayback Machine, nap.edu. Hentet 5. januar 2007.

nasa.gov

cryowwwebber.gsfc.nasa.gov

Warner, Brent. "Introduction to Liquid Helium". NASA. Arkiveret fra originalen 1. september 2005. Hentet 2007-01-05.

hq.nasa.gov

Eugene M. Emme, comp., red. (1961). "Aeronautics and Astronautics Chronology, 1920–1924". Aeronautics and Astronautics: An American Chronology of Science and Technology in the Exploration of Space, 1915–1960. Washington, DC: NASA. s. 11-19. Arkiveret fra originalen 14. juli 2019. Hentet 2007-01-05.

nationalacademies.org

www7.nationalacademies.org

"Helium Privatization Act of 1996". Arkiveret fra originalen 6. juli 2008. Hentet 2007-01-05.

nature.com

Willem Hendrik Keesom (1926). "Solidification of Helium" ( (Webside ikke længere tilgængelig) – ^{Scholar search}). Nature. 118: 81. doi:10.1038/118081a0. Arkiveret (PDF) fra originalen 25. juni 2008. Hentet 2008-07-23. {{cite journal}}: Ekstern henvisning i |format= (hjælp)

nih.gov

pubmed.ncbi.nlm.nih.gov

Fowler, B; Ackles, KN; Porlier, G (1985). "Effects of inert gas narcosis on behavior--a critical review". Undersea Biomedical Research Journal. PMID 4082343. Arkiveret fra originalen 25. december 2010. Hentet 2008-06-27.
Thomas, JR (1976). "Reversal of nitrogen narcosis in rats by helium pressure". Undersea Biomed Res. 3 (3): 249-59. PMID 969027. Hentet 2008-06-27.
Rostain, J. C.; Gardette-Chauffour, M. C.; Lemaire, C.; Naquet, R. (1988). "Effects of a H2-He-O2 mixture on the HPNS up to 450 msw". Undersea Biomed. Res. 15 (4): 257-70. ISSN 0093-5387. OCLC 2068005. PMID 3212843. Arkiveret fra originalen 25. december 2010. Hentet 2008-06-24.
H. P. Cady and D. F. McFarland (1906). "Helium in Natural Gas". Science. 14: 344. doi:10.1126/science.24.611.344. PMID 17772798.
Martin Saunders, Hugo A. Jiménez-Vázquez, R. James Cross, and Robert J. Poreda (1993). "Stable Compounds of Helium and Neon: He@C₆₀ and Ne@C₆₀". Science. 259 (5100): 1428-1430. doi:10.1126/science.259.5100.1428. PMID 17801275.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)

ncbi.nlm.nih.gov

Thomas, JR (1976). "Reversal of nitrogen narcosis in rats by helium pressure". Undersea Biomed Res. 3 (3): 249-59. PMID 969027. Hentet 2008-06-27.

rubicon-foundation.org

archive.rubicon-foundation.org

Fowler, B; Ackles, KN; Porlier, G (1985). "Effects of inert gas narcosis on behavior--a critical review". Undersea Biomedical Research Journal. PMID 4082343. Arkiveret fra originalen 25. december 2010. Hentet 2008-06-27.
Rostain, J. C.; Gardette-Chauffour, M. C.; Lemaire, C.; Naquet, R. (1988). "Effects of a H2-He-O2 mixture on the HPNS up to 450 msw". Undersea Biomed. Res. 15 (4): 257-70. ISSN 0093-5387. OCLC 2068005. PMID 3212843. Arkiveret fra originalen 25. december 2010. Hentet 2008-06-24.

sciencemag.org

Astronomers have spotted the universe’s first molecule. Science 2019

scuba-doc.com

HPNS, scuba-doc.com. Hentet 5. januar 2007.

slate.com

Stay Out of That Balloon! The dangers of helium inhalation, Slate.com. Retrieved on 18 September 2007.

thespacereview.com

Eric R. Hedman (16. januar 2006). "A fascinating hour with [[Gerald Kulcinski]]". The Space Review. {{cite news}}: Konflikt mellem URL og wikilink (hjælp)

unsw.edu.au

phys.unsw.edu.au

Physics in speech Arkiveret 10. december 2004 hos Wayback Machine, phys.unsw.edu.au. Hentet 5. januar 2007.

usra.edu

lpi.usra.edu

E. N. Slyuta and A. M. Abdrakhimov, and E. M. Galimov (2007). "The estimation of helium-3 probable reserves in lunar regolith" (PDF). Lunar and Planetary Science XXXVIII.

weather.gov

srh.weather.gov

"The Atmosphere: Introduction". JetStream - Online School for Weather. National Weather Service. Arkiveret fra originalen 13. januar 2008. Hentet 6. juli 2008.

web.archive.org

"Periodic Table: Helium". Los Alamos National Laboratory (LANL.gov):. Arkiveret fra originalen 2. juni 2008. Hentet 2008-07-23.{{cite web}}: CS1-vedligeholdelse: Ekstra punktum (link)
"Solid Helium". Department of Physics University of Alberta. 2005-10-05. Arkiveret fra originalen den 5. november 2008. Hentet 6. juli 2008.{{cite web}}: CS1-vedligeholdelse: BOT: original-url status ukendt (link)
Warner, Brent. "Introduction to Liquid Helium". NASA. Arkiveret fra originalen 1. september 2005. Hentet 2007-01-05.
Fowler, B; Ackles, KN; Porlier, G (1985). "Effects of inert gas narcosis on behavior--a critical review". Undersea Biomedical Research Journal. PMID 4082343. Arkiveret fra originalen 25. december 2010. Hentet 2008-06-27.
Rostain, J. C.; Gardette-Chauffour, M. C.; Lemaire, C.; Naquet, R. (1988). "Effects of a H2-He-O2 mixture on the HPNS up to 450 msw". Undersea Biomed. Res. 15 (4): 257-70. ISSN 0093-5387. OCLC 2068005. PMID 3212843. Arkiveret fra originalen 25. december 2010. Hentet 2008-06-24.
"CERN - LHC: Facts and Figures" (PDF). CERN. Arkiveret fra LHC Guide booklet originalen 6. juli 2011. Hentet 2008-04-30. {{cite web}}: Tjek |url= (hjælp)
Physics in speech Arkiveret 10. december 2004 hos Wayback Machine, phys.unsw.edu.au. Hentet 5. januar 2007.
Dirk van Delft (2008). "Little cup of Helium, big Science" (PDF). Physics today. s. 36-42. Arkiveret fra originalen (PDF) 25. juni 2008. Hentet 2008-07-23.
Willem Hendrik Keesom (1926). "Solidification of Helium" ( (Webside ikke længere tilgængelig) – ^{Scholar search}). Nature. 118: 81. doi:10.1038/118081a0. Arkiveret (PDF) fra originalen 25. juni 2008. Hentet 2008-07-23. {{cite journal}}: Ekstern henvisning i |format= (hjælp)
American Chemical Society (2004). "The Discovery of Helium in Natural Gas". Arkiveret fra originalen 20. maj 2006. Hentet 2006-05-17.
Eugene M. Emme, comp., red. (1961). "Aeronautics and Astronautics Chronology, 1920–1924". Aeronautics and Astronautics: An American Chronology of Science and Technology in the Exploration of Space, 1915–1960. Washington, DC: NASA. s. 11-19. Arkiveret fra originalen 14. juli 2019. Hentet 2007-01-05.
"Helium Privatization Act of 1996". Arkiveret fra originalen 6. juli 2008. Hentet 2007-01-05.
Executive Summary Arkiveret 2. maj 2005 hos Wayback Machine, nap.edu. Hentet 5. januar 2007.
DM Smith, TW Goodwin, J Schillinger (2003). "Challenges to the Worldwide Supply of Helium in the Next Decade" (PDF). Advances in Cryogenic Engineering. 49 A. Arkiveret fra originalen (PDF) 25. juni 2008. Hentet 6. juli 2008.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)
Weiss, Achim. "Elements of the past: Big Bang Nucleosynthesis and observation". Max Planck Institute for Gravitational Physics. Arkiveret fra originalen 8. februar 2007. Hentet 2008-06-23.; Coc, A.; et al. (2004). "Updated Big Bang Nucleosynthesis confronted to WMAP observations and to the Abundance of Light Elements". Astrophysical Journal. 600: 544. doi:10.1086/380121. {{cite journal}}: Eksplicit brug af et al. i: |author= (hjælp)
"The Atmosphere: Introduction". JetStream - Online School for Weather. National Weather Service. Arkiveret fra originalen 13. januar 2008. Hentet 6. juli 2008.
Z. Cai, R. Clarke, N. Ward, W. J. Nuttall, B. A. Glowacki. "Modelling Helium Markets" (PDF). Arkiveret fra originalen (PDF) 25. juni 2008. Hentet 6. juli 2008. {{cite journal}}: Cite journal kræver |journal= (hjælp)CS1-vedligeholdelse: Flere navne: authors list (link)
"FTI Research Projects :: 3He Lunar Mining". Arkiveret fra originalen 4. september 2006. Hentet 6. juli 2008.
"Helium - Valency". Arkiveret fra originalen 2. juni 2008. Hentet 14. maj 2008.

webelements.com

WebElements Periodic Table: Professional Edition: Helium: key information

wesleyan.edu

fellis.web.wesleyan.edu

Ellis, Fred M. "Third sounds". Wesleyan Quantum Fluids Laboratory. Hentet 2008-07-23.

wisc.edu

fti.neep.wisc.edu

"FTI Research Projects :: 3He Lunar Mining". Arkiveret fra originalen 4. september 2006. Hentet 6. juli 2008.

worldcat.org

Rostain, J. C.; Gardette-Chauffour, M. C.; Lemaire, C.; Naquet, R. (1988). "Effects of a H2-He-O2 mixture on the HPNS up to 450 msw". Undersea Biomed. Res. 15 (4): 257-70. ISSN 0093-5387. OCLC 2068005. PMID 3212843. Arkiveret fra originalen 25. december 2010. Hentet 2008-06-24.

yutopian.com

Yuan, Sidney. "The Two Fluid Model of Superfluid Helium (He II, Superfluidity)". Yutiopian.com. Hentet 2008-07-23.