TY  - JOUR
AU  - A. P. Sadovskii
TI  - Centers and Foci for a Class of Cubic Systems
JO  - Differencialʹnye uravneniâ
PY  - 2000
SP  - 1652
EP  - 1657
VL  - 36
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2000_36_12_a8/
LA  - ru
ID  - DE_2000_36_12_a8
ER  -