Kovalenko A Ya

Publications in Math-Net.Ru

1. Perturbation of the periodic solutions of differential equations in the case when the spectrum of the monodromy operator of the generating equation contains 1
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1971, no. 7,  44–49
2. The highest exponent and the critical exponent of certain differential equations in a Banach space
   
   Differ. Uravn., 3:8 (1967),  1259–1265