%0 Journal Article
%A N. I. Vulpe
%A K. S. Sibirskii
%T Geometric classification of a quadratic differential system
%J Differencialʹnye uravneniâ
%D 1977
%P 803-814
%V 13
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_5_a1/
%G ru
%F DE_1977_13_5_a1