%0 Journal Article
%A G. S. Rychkov
%T The maximum number of limit cycles of the equation $(y-P_3(x))dy=P_1(x,y)dx$ in the case of three singular points
%J Differencialʹnye uravneniâ
%D 1985
%P 991-997
%V 21
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1985_21_6_a9/
%G ru
%F DE_1985_21_6_a9