%0 Journal Article
%A Ya. G. Sinai
%T Billiard trajectories in a~polyhedral angle
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1978
%P 219-220
%V 33
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1978_33_1_a19/
%G en
%F RM_1978_33_1_a19