%0 Journal Article
%A L. A. Cherkas
%T The Dulac function for polynomial autonomous systems on a plane
%J Differencialʹnye uravneniâ
%D 1997
%P 689-699
%V 33
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1997_33_5_a18/
%G ru
%F DE_1997_33_5_a18