TY  - JOUR
AU  - I. G. Rozet
TI  - Coefficient criteria for the existence of separatrix cycles for a certain quadratic equation
JO  - Differencialʹnye uravneniâ
PY  - 1972
SP  - 1791
EP  - 1796
VL  - 8
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1972_8_10_a8/
LA  - ru
ID  - DE_1972_8_10_a8
ER  -