%0 Journal Article
%A Bularas Driss
%A N. I. Vulpe
%A K. S. Sibirskii
%T Solution of a problem of the center ``in the large'' for a general quadratic differential system
%J Differencialʹnye uravneniâ
%D 1989
%P 1856-1862
%V 25
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1989_25_11_a3/
%G ru
%F DE_1989_25_11_a3