TY  - JOUR
AU  - G. S. Rychkov
TI  - Uniqueness of the limit cycle of the equation $(y-P_3(x))dy=P_1(x,y)dx$
JO  - Differencialʹnye uravneniâ
PY  - 1980
SP  - 433
EP  - 437
VL  - 16
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1980_16_3_a5/
LA  - ru
ID  - DE_1980_16_3_a5
ER  -