%0 Journal Article
%A K. S. Sibirskii
%T Coefficient conditions for the center in the sense of Dulac of a differential system with a zero characteristic root and homogeneous nonlinearities
%J Differencialʹnye uravneniâ
%D 1987
%P 2171-2173
%V 23
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1987_23_12_a25/
%G ru
%F DE_1987_23_12_a25