%0 Journal Article
%A V. K. Akhramenko
%A A. P. Sadovskii
%T Necessary conditions for a center for a differential system with a complex singular point
%J Differencialʹnye uravneniâ
%D 1988
%P 2032-2042
%V 24
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1988_24_12_a1/
%G ru
%F DE_1988_24_12_a1