1. Aksenov, E. P.: 1979?, Astron. Zh. 56, 419.
2. Aksenov, E. P.: 1979?, Astron. Zh. 56, 623.
3. Duboshin, G. N.: 1974?, Celestial Mech. 8, 495.
4. Duboshin, G. N.: 1975: Celestial Mechanics Fundamental Problem and Methods, Nauka, Moscow.
5. Duboshin, G. N.: 1984?, Celestial Mech. 33, 31.