TY  - JOUR
AU  - L. A. Cherkas
TI  - Bifurcations of limit cycles of a quadratic system with a change of parameter which rotates the field
JO  - Differencialʹnye uravneniâ
PY  - 1981
SP  - 2002
EP  - 2016
VL  - 17
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1981_17_11_a8/
LA  - ru
ID  - DE_1981_17_11_a8
ER  -