%0 Journal Article
%A V. A. Lunkevich
%A K. S. Sibirskii
%T Integrals of a general quadratic differential system in cases of the center
%J Differencialʹnye uravneniâ
%D 1982
%P 786-792
%V 18
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1982_18_5_a8/
%G ru
%F DE_1982_18_5_a8