%0 Journal Article
%A S. V. Buyalo
%T Closed geodesics on 2-dimensional orbifolds of nonpositive curvature
%J Algebra i analiz
%D 1989
%P 89-109
%V 1
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AA_1989_1_3_a3/
%G ru
%F AA_1989_1_3_a3