%0 Journal Article
%A A. S. Gurtovnik
%A Yu. I. Neimark
%T Investigation of the neighborhood of a family of invariant toroidal manifolds
%J Differencialʹnye uravneniâ
%D 1973
%P 821-831
%V 9
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1973_9_5_a4/
%G ru
%F DE_1973_9_5_a4