TY  - JOUR
AU  - L. A. Cherkas
TI  - Absence of cycles in the equation $y'=Q_2(x,y)/P_2(x,y)$, with a focus of third degree of structural instability
JO  - Differencialʹnye uravneniâ
PY  - 1976
SP  - 2281
EP  - 2282
VL  - 12
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1976_12_12_a22/
LA  - ru
ID  - DE_1976_12_12_a22
ER  -