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2. V. V. Beletskii, Notes on the motion of Celestial Bodies (Nauka, Moscow, 1972) [in Russian].
3. E. A. Grebennikov and Yu. A. Ryabov, Resonances and Small Denominators in the Celestial Mechanics (Nauka, Moscow, 1978) [in Russian].
4. G. N. Duboshin, Celestial Mechanics. Main Problems and Methods (Nauka, Moscow, 1975) [in Russian].
5. M. Ya. Marov, Planety solnechnoi sistemy (Planets of the Solar System) (Nauka, Moscow, 1981) [in Russian].