TY  - JOUR
AU  - A. S. Shube
TI  - On the structure of an integrating factor for a cubic system with a singular point of center type
JO  - Differencialʹnye uravneniâ
PY  - 1996
SP  - 713
EP  - 715
VL  - 32
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1996_32_5_a21/
LA  - ru
ID  - DE_1996_32_5_a21
ER  -