1. Study of certain nonstationary problems of celestial mechanics using the transformation methods;Berkovich,1975
2. Gil 'den-Meshcherskii problem and laws of mass change;Berkovich;Dokl. Akad. Nauk SSSR,1980
3. Transformation of the Gil'den-Meshcherskii problem to its stationary form and the laws of mass change;Berkovich;PMM,1980
4. On the bounded two-body of variable mass problem;Radzievskii;Astron. Zh.,1957