%0 Journal Article
%A G. M. Buldyk
%T The existence of limit cycles of the equation $(1+x)yy'=-P_4(x)-P_2(x)y+\delta y^2$ in a singular case
%J Differencialʹnye uravneniâ
%D 1978
%P 817-823
%V 14
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1978_14_5_a3/
%G ru
%F DE_1978_14_5_a3