%0 Journal Article
%A A. P. Sadovskii
%T Centers and Foci for a Class of Cubic Systems
%J Differencialʹnye uravneniâ
%D 2000
%P 1652-1657
%V 36
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_2000_36_12_a8/
%G ru
%F DE_2000_36_12_a8