%0 Journal Article
%A L. A. Cherkas
%T Conditions for the center for certain equations of the form $yy'=P(x)+Q(x)y+R(x)y^2$
%J Differencialʹnye uravneniâ
%D 1972
%P 1435-1439
%V 8
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1972_8_8_a12/
%G ru
%F DE_1972_8_8_a12