London, F. (1938). “The λ-Phenomenon of Liquid Helium and the Bose-Einstein Degeneracy”. Nature141 (3571): 643–644. doi:10.1038/141643a0. ISSN0028-0836.
Tisza, L. (1940). “Sur la théorie des liquides quantiques. Application à l'hélium liquide. II”. Journal de Physique et le Radium1 (8): 350–358. doi:10.1051/jphysrad:0194000108035000. ISSN0368-3842.
Penrose, O. (1951). “CXXXVI. On the quantum mechanics of helium II”. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science42 (335): 1373–1377. doi:10.1080/14786445108560954. ISSN1941-5982.
Penrose, Oliver; Onsager, Lars (1956). “Bose-Einstein Condensation and Liquid Helium”. Physical Review104 (3): 576–584. doi:10.1103/PhysRev.104.576. ISSN0031-899X.
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Kapitza, P. (1938). “Viscosity of Liquid Helium below the λ-Point”. Nature141 (3558): 74–74. doi:10.1038/141074a0. ISSN0028-0836.
London, F. (1938). “The λ-Phenomenon of Liquid Helium and the Bose-Einstein Degeneracy”. Nature141 (3571): 643–644. doi:10.1038/141643a0. ISSN0028-0836.
Tisza, L. (1940). “Sur la théorie des liquides quantiques. Application à l'hélium liquide. II”. Journal de Physique et le Radium1 (8): 350–358. doi:10.1051/jphysrad:0194000108035000. ISSN0368-3842.
Penrose, O. (1951). “CXXXVI. On the quantum mechanics of helium II”. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science42 (335): 1373–1377. doi:10.1080/14786445108560954. ISSN1941-5982.
Penrose, Oliver; Onsager, Lars (1956). “Bose-Einstein Condensation and Liquid Helium”. Physical Review104 (3): 576–584. doi:10.1103/PhysRev.104.576. ISSN0031-899X.