%0 Journal Article
%A V. E. Chernyshev
%T Existence of closed trajectories in the neighborhood of an invariant torus
%J Differencialʹnye uravneniâ
%D 1979
%P 1620-1631
%V 15
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1979_15_9_a9/
%G ru
%F DE_1979_15_9_a9