%0 Journal Article
%A V. V. Nemytskii
%A Yu. V. Malyshev
%T A qualitative investigation of potential systems
%J Differencialʹnye uravneniâ
%D 1969
%P 1550-1557
%V 5
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1969_5_9_a1/
%G ru
%F DE_1969_5_9_a1