%0 Journal Article
%A I. M. Belen'kii
%T Sufficient conditions for the absence of periodic trajectories of autonomous systems in the case of multiply connected regions
%J Differencialʹnye uravneniâ
%D 1967
%P 1248-1252
%V 3
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1967_3_8_a2/
%G ru
%F DE_1967_3_8_a2