1. M. B. Balk, Elements of Space Flight Dynamics (Nauka, Moscow, 1965) [in Russian].
2. V. V. Beletskii, Essays on the Motion of Space Bodies (Nauka, Moscow, 1977) [in Russian].
3. Handbook of Celestial Mechanics and Astrodynamics, Ed. by G. N. Duboshin (Nauka, Moscow, 1976) [in Russian].
4. V. Szebehely, Theory of Orbits (Academic, New York, 1967; Nauka, Moscow, 1982).
5. A. M. Il’in, Matching of Asymptotic Expansions of Solutions of Boundary Value Problems (Nauka, Moscow, 1989; Am. Math. Soc., RI, Providence, 1992).