1. A. Einstein, Collection of Works, V. 1 [Russian translation], Nauka, Moscow, 1965.
2. D. Hilbert, Selected Papers, V. 2, [Russian translation], Faktorial, Moscow, 1998.
3. B. S. De Witt, Phys. Rev., 160D, 1113 (1967).
4. B. S. De Witt, 162D, 1195 (1967).
5. A. A. Logunov, A Theory of Gravitational Field, Nauka, Moscow, 2001.