%0 Journal Article
%A L. P. Shilnikov
%T Existence of a countable set of periodic motions in a four-dimensional space in an extended neighborhood of a saddle-focus
%J Doklady Akademii Nauk
%D 1967
%P 54-57
%V 172
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_172_1_a13/
%G ru
%F DAN_1967_172_1_a13