%0 Journal Article
%A A. S. Shube
%T On the Kukles and Cherkas center conditions for a cubic system
%J Differencialʹnye uravneniâ
%D 1993
%P 728-730
%V 29
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1993_29_4_a21/
%G ru
%F DE_1993_29_4_a21