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Sadeh, D. (1963). «Experimental Evidence for the Constancy of the Velocity of Gamma Rays, Using Annihilation in Flight». Physical Review Letters10 (7): 271-273. Bibcode:1963PhRvL..10..271S. doi:10.1103/PhysRevLett.10.271.
Alväger, T.; Farley, F. J. M.; Kjellman, J.; Wallin, L. (1964), «Test of the second postulate of special relativity in the GeV region», Physics Letters12 (3): 260-262, Bibcode:1964PhL....12..260A, doi:10.1016/0031-9163(64)91095-9..
Babcock, G. C.; Bergman, T. G. (1964), «Determination of the Constancy of the Speed of Light», Journal of the Optical Society of America54 (2): 147-150, Bibcode:1964JOSA...54..147B, doi:10.1364/JOSA.54.000147.
Michelson, A.A. (1913). «Effect of Reflection from a Moving Mirror on the Velocity of Light». Astrophysical Journal37: 190-193. Bibcode:1913ApJ....37..190M. doi:10.1086/141987.