%0 Journal Article
%A Yu. S. Bogdanov
%T Some tests for the absence of closed trajectories
%J Doklady Akademii Nauk
%D 1958
%P 939-940
%V 120
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1958_120_5_a1/
%G ru
%F DAN_1958_120_5_a1