%0 Journal Article
%A È. F. Gasinskaya
%A K. S. Sibirskii
%T Affine invariants of a system with quadratic nonlinearities
%J Differencialʹnye uravneniâ
%D 1973
%P 1371-1382
%V 9
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1973_9_8_a1/
%G ru
%F DE_1973_9_8_a1