1. G. N. Duboshin, Celestial Mechanics. Fundamental Problems and Methods (Nauka, Moscow, 1975) [in Russian].
2. M. F. Subbotin, Introduction to Theoretical Astronomy (Nauka, Moscow, 1968) [in Russian].
3. J. L. Laskar, Astron. Astrophys. 198, 341 (1988).
4. J. L. Simon, P. Bretagnon, J. Chapront, et al., Astron. Astrophys. 282, 663 (1994).
5. K. V. Khoshevnikov and E. D. Kuznetsov, Solar Syst. Res. 41, 265 (2007).