1. E. E. Feinberg, Usp. Fiz, Nauk,167, No. 4 (1997).
2. G. Yu. Bogoslovskii, Theory of Locally Anisotropic Space-Time [in Russian], Publishing House of Moscow State University, Moscow (1992).
3. V. G. Vafiadi and Yu. V. Popov, Velocity of Light and its Importance for Science and Engineering [in Russian], Publishing House of Byelorussian State University, Minsk (1970).
4. K. Frum and L. Essen, Velocity of Light and Radio Waves [Russian translation], Mir, Moscow (1973).
5. S. I. Vavilov, Complete Works, Vol. 4 [in Russian], Akad. Nauk SSSR, Moscow (1956).