TY  - JOUR
AU  - Ya. B. Vorobets
TI  - On the measure of the set of periodic points of the billiard
JO  - Matematičeskie zametki
PY  - 1994
SP  - 25
EP  - 35
VL  - 55
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1994_55_5_a2/
LA  - ru
ID  - MZM_1994_55_5_a2
ER  -