%0 Journal Article
%A I. A. Konovalov
%T Certain sufficient tests for the existence of limit cycles of a certain dynamic system
%J Differencialʹnye uravneniâ
%D 1971
%P 226-231
%V 7
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1971_7_2_a4/
%G ru
%F DE_1971_7_2_a4