TY  - JOUR
AU  - M. M. Dvorin
AU  - V. F. Lazutkin
TI  - The existence of an infinite number of elliptic and hyperbolic periodic trajectories for a convex billiard
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1973
SP  - 20
EP  - 27
VL  - 7
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1973_7_2_a3/
LA  - ru
ID  - FAA_1973_7_2_a3
ER  -