TY  - JOUR
AU  - A. A. Grin'
TI  - A cubic Dulac function for a polynomial autonomous system on the plane with right-hand sides that are fourth-order nonlinearities
JO  - Differencialʹnye uravneniâ
PY  - 2000
SP  - 558
EP  - 560
VL  - 36
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2000_36_4_a18/
LA  - ru
ID  - DE_2000_36_4_a18
ER  -