%0 Journal Article
%A G. S. Rychkov
%T Uniqueness of the limit cycle of the equation $(y-P_3(x))dy=P_1(x,y)dx$
%J Differencialʹnye uravneniâ
%D 1980
%P 433-437
%V 16
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1980_16_3_a5/
%G ru
%F DE_1980_16_3_a5