1. V. I. Antonov, V. N. Efremov, and Yu. S. Vladimirov, Gen. Rel. Grav. 9, 9 (1978).
2. Yu. S. Vladimirov, Reference Frames in Gravitation Theory (Energoizdat, Moscow, 1982, in Russian).
3. N. V. Mitskievich, Relativistic physics in an arbitrary reference frame, arxiv: gr-qc/9606051.
4. J. L. Synge, Relativity: The General Theory (Amsterdam, North-Holland Publishing Company, 1960).
5. V. I. Arnold, Ordinary Differential Equations (UGU, RCHD, Izhevsk, 2000, in Russian).