Konovalov Ju P

Publications in Math-Net.Ru

1. The almost periodic solutions of quasiharmonic systems with lag
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1969, no. 10,  62–69
2. Periodic solutions of quasi-harmonic systems with retardation
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1967, no. 6,  59–67