%0 Journal Article
%A L. A. Cherkas
%A G. M. Buldyk
%T Integral curves of a certain class of differential equations that have a center
%J Differencialʹnye uravneniâ
%D 1976
%P 2102-2104
%V 12
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1976_12_11_a26/
%G ru
%F DE_1976_12_11_a26