1. Jeans, J. H.: 1924,Monthly Notices Roy. Astron. Soc. 85, 2.
2. Jeans, J. H.: 1928,Astronomy and Cosmogony, Cambridge.
3. Meshcherskii, I. V.: 1949,Studies on the Mechanics of Bodies of Variable Mass. Gostekhizdat, Moscow, Leningrad.
4. Omarov, T. B.: 1963,Sov. Astron. 8, 127.
5. Radzievskii, V. V.: 1954, ?Problem of Photo Gravitational Celestial Mechanics? (in Russian), Dissertation State Astronomical Observatory.