%0 Journal Article
%A N. L. Shcheglova
%T Investigation of systems with homogeneous cubic nonlinearities that have a focus and a center
%J Differencialʹnye uravneniâ
%D 1993
%P 246-255
%V 29
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1993_29_2_a7/
%G ru
%F DE_1993_29_2_a7