Belen'kii I M

Publications in Math-Net.Ru

1. Sufficient conditions for the absence of periodic trajectories of autonomous systems in the case of multiply connected regions
   
   Differ. Uravn., 3:8 (1967),  1248–1252
2. A new analogy in mechanics
   
   Dokl. Akad. Nauk SSSR, 140:6 (1961),  1278–1280