%0 Journal Article
%A V. E. Chernyshev
%T Closed trajectories in the neighborhood of an invariant torus
%J Differencialʹnye uravneniâ
%D 1980
%P 374-376
%V 16
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1980_16_2_a23/
%G ru
%F DE_1980_16_2_a23