%0 Journal Article
%A V. V. Amel'kin
%T On conditions for the existence of limit cycles in two-dimensional autonomous systems of differential equations
%J Differencialʹnye uravneniâ
%D 1995
%P 2070-2072
%V 31
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1995_31_12_a15/
%G ru
%F DE_1995_31_12_a15