1. R. Tolman, Relativity, Thermodynamics and Cosmology (Nauka, Moscow, 1974) [in Russian].
2. D. Hilbert, Selected Works (Izd-vo Faktorial, Moscow, 1998) [in Russian].
3. V. A. Fok, Theory of Space, Time and Gravitation (Gostekhizdat, Moscow, 1961) [in Russian].
4. J. L. Synge, General Theory of Relativity (Inostr. Lit., Moscow, 1963) [in Russian].
5. L. D. Landau and E. M. Lifshits, Field Theory (Fizmatlit, Moscow, 2001) [in Russian].