Cherevichny P T

Publications in Math-Net.Ru

1. The index of a singular point of the equation $y'=\frac{P_4(x,y)}{Q_4(x,y)}$
   
   Differ. Uravn., 13:3 (1977),  463–467
2. Three theorems on the Poincaré index for the equation $y'=P_4(x,y)/Q_4(x,y)$
   
   Differ. Uravn., 9:4 (1973),  778–779
3. Formulae for the computation of the index of a singular point of the equation $y'=\frac{P_3(x,y)}{Q_3(x,y)}$ in terms of the coefficients
   
   Differ. Uravn., 6:7 (1970),  1318–1319