TY  - JOUR
AU  - A. N. Novokhrost
TI  - Limit cycles of a quadratic system that has a particular integral in the form of a parabola
JO  - Differencialʹnye uravneniâ
PY  - 1991
SP  - 1981
EP  - 1983
VL  - 27
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1991_27_11_a16/
LA  - ru
ID  - DE_1991_27_11_a16
ER  -