TY  - JOUR
AU  - A. S. Shube
TI  - On the Kukles and Cherkas center conditions for a cubic system
JO  - Differencialʹnye uravneniâ
PY  - 1993
SP  - 728
EP  - 730
VL  - 29
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1993_29_4_a21/
LA  - ru
ID  - DE_1993_29_4_a21
ER  -