TY  - JOUR
AU  - A. S. Shube
TI  - Sufficient conditions for the center for a two-dimensional autonomous system with cubic right-hand sides
JO  - Differencialʹnye uravneniâ
PY  - 1989
SP  - 2014
EP  - 2016
VL  - 25
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1989_25_11_a32/
LA  - ru
ID  - DE_1989_25_11_a32
ER  -