TY  - JOUR
AU  - Ya. B. Vorobets
TI  - Billiards in rational polygons: Periodic trajectories, symmetries and $d$-stability
JO  - Matematičeskie zametki
PY  - 1997
SP  - 66
EP  - 75
VL  - 62
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1997_62_1_a6/
LA  - ru
ID  - MZM_1997_62_1_a6
ER  -