Akhramenko Viktor Korneevich

Publications in Math-Net.Ru

1. Necessary conditions for a center for a differential system with a complex singular point
   
   Differ. Uravn., 24:12 (1988),  2032–2042
2. Third order homogeneous differential equations with univalent polar variable singular points
   
   Differ. Uravn., 13:4 (1977),  733–734