%0 Journal Article
%A Yu. N. Bibikov
%T The stability of periodic motions in the transcendental case of two pure imaginary characteristic exponents
%J Doklady Akademii Nauk
%D 1970
%P 506-509
%V 190
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_190_3_a3/
%G ru
%F DAN_1970_190_3_a3