%0 Journal Article
%A N. F. Otrokov
%T Conditions for the existence of a loop of a separatrix
%J Differencialʹnye uravneniâ
%D 1970
%P 1761-1771
%V 6
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1970_6_10_a2/
%G ru
%F DE_1970_6_10_a2