%0 Journal Article
%A K. S. Sibirskii
%T Centroaffine invariant center conditions in the sense of Dulac for a quadratic differential system
%J Differencialʹnye uravneniâ
%D 1986
%P 954-961
%V 22
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1986_22_6_a4/
%G ru
%F DE_1986_22_6_a4