%0 Journal Article
%A L. A. Cherkas
%T Absence of limit cycles around a triple focus in a quadratic system in a plane
%J Differencialʹnye uravneniâ
%D 1986
%P 2015-2017
%V 22
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1986_22_11_a27/
%G ru
%F DE_1986_22_11_a27