TY  - JOUR
AU  - F. S. Duzhin
TI  - Lower bounds on the number of closed trajectories of generalized billiards
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 2005
SP  - 113
EP  - 126
VL  - 325
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_2005_325_a6/
LA  - ru
ID  - ZNSL_2005_325_a6
ER  -