TY  - JOUR
AU  - G. S. Rychkov
TI  - The maximum number of limit cycles of the equation $(y-P_3(x))dy=P_1(x,y)dx$ in the case of three singular points
JO  - Differencialʹnye uravneniâ
PY  - 1985
SP  - 991
EP  - 997
VL  - 21
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1985_21_6_a9/
LA  - ru
ID  - DE_1985_21_6_a9
ER  -