%0 Journal Article %A L. N. Stoyanov %T Typical properties of periodic billiard trajectories %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1987 %P 235-236 %V 42 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1987_42_3_a20/ %G en %F RM_1987_42_3_a20