Yuzbashev Georgy L'vovich

Publications in Math-Net.Ru

1. Family of periodic solutions of a system of second order differential equations without dissipation
   
   Differ. Uravn., 10:3 (1974),  567–568
2. A study of the set of periodic solutions of a certain system of second order differential equations without dissipation
   
   Differ. Uravn., 9:9 (1973),  1734–1737