%0 Journal Article
%A G. M. Buldyk
%T The number of Ljapunov constants for the conditions of the center of a certain differential equation
%J Differencialʹnye uravneniâ
%D 1974
%P 606-612
%V 10
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1974_10_4_a4/
%G ru
%F DE_1974_10_4_a4