%0 Journal Article
%A Yu. N. Bibikov
%T The existence of invariant tori in the neighborhodd of a state of equilbrium of a system of differential equations
%J Doklady Akademii Nauk
%D 1969
%P 9-12
%V 185
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_185_1_a0/
%G ru
%F DAN_1969_185_1_a0