1. G. N. Duboshin, Theory of Attraction (Fizmatlit, Moscow, 1961) [in Russian].
2. W. Kaula, Theory of satellite geodesy (Blaisdell, Waltham, MA, 1966; Mir, Moscow, 1970).
3. M. Burša, Fundamentals of Space Geodesy, Vol. 2: Dynamic Cosmic Geodesy (Minist. Nár. Obrany, Prague, 1970; Nedra, Moscow, 1975) [in Czech].
4. N. P. Grushinskii, Theory of the Earth Figure (Nauka, Moscow, 1976) [in Russian].
5. B. P. Kondrat’ev, Theory of Potential and Figures of Equilibrium (Inst. Komp. Issled., Moscow, 2003) [in Russian].