TY  - JOUR
AU  - L. A. Cherkas
TI  - The Dulac function for polynomial autonomous systems on a plane
JO  - Differencialʹnye uravneniâ
PY  - 1997
SP  - 689
EP  - 699
VL  - 33
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1997_33_5_a18/
LA  - ru
ID  - DE_1997_33_5_a18
ER  -