%0 Journal Article
%A S. Kh. Aranson
%T Trajectories on nonorientable two-dimensional manifolds
%J Sbornik. Mathematics
%D 1969
%P 297-313
%V 9
%N 3
%U http://geodesic.mathdoc.fr/item/SM_1969_9_3_a1/
%G en
%F SM_1969_9_3_a1