Turaev A T

Publications in Math-Net.Ru

1. Some criteria for the existence of limit cycles of a differential equation
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1970, no. 5,  92–95
2. Certain methods of obtaining criteria for the existence and nonexistence of periodic solutions of a differential equation
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1966, no. 4,  129–133