%0 Journal Article
%A F. S. Duzhin
%T Lower bounds on the number of closed trajectories of generalized billiards
%J Zapiski Nauchnykh Seminarov POMI
%D 2005
%P 113-126
%V 325
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_2005_325_a6/
%G ru
%F ZNSL_2005_325_a6