%0 Journal Article
%A L. A. Cherkas
%A L. I. Zhilevich
%T Some tests for the absence or uniqueness of limit cycles
%J Differencialʹnye uravneniâ
%D 1970
%P 1170-1178
%V 6
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1970_6_7_a2/
%G ru
%F DE_1970_6_7_a2