%0 Journal Article
%A L. A. Cherkas
%A L. I. Zhilevich
%T The limit cycles of certain differential equations
%J Differencialʹnye uravneniâ
%D 1972
%P 1207-1213
%V 8
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1972_8_7_a6/
%G ru
%F DE_1972_8_7_a6