1. Alväger, T., Nilsson, A., and Kjellman, J., On the Independence of the Velocity of Light of the Motion of the Light Source, Arkiv for Fysik, 1964, vol. 2, no. 16, pp. 209–211.
2. Alväger, T., Farley, F.J., Kjellman, J., and Wallin, I., Test of the Second Postulate of Special Relativity in the GeV Region, Phys. Rev. Lett., 1964, vol. 12, no. 3, pp. 260–262.
3. Babcock, G.C. and Bergman, T.G., Determination of the Constancy of the Speed of Light, J. Opt. Soc. Am., 1964, vol. 54, no. 2, pp. 147–151.
4. Beckmann, P. and Mandics, P., Test of the Constancy of the Velocity of Electromagnetic Radiation in High Vacuum, Radio Science Journal of R.N.B.S, 1965, vol. 69, no. 4, pp. 623–628.
5. Boemmel, H., Measurement of the Frequency Shift of Gamma Rays in Accelerated Systems Using the Maessbauer Effect, In Mossbauer effect, Ld., 1962, pp. 229–232.