%0 Journal Article
%A L. A. Cherkas
%A A. A. Grin'
%T A Dulac function in a half-plane in the form of a polynomial of the second degree for a quadratic system
%J Differencialʹnye uravneniâ
%D 1998
%P 1346-1348
%V 34
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1998_34_10_a7/
%G ru
%F DE_1998_34_10_a7