%0 Journal Article
%A P. Sarnak
%A R.S. Phillips
%T On cusp forms for co-finite subgroups of PSL(2, IR).
%J Inventiones mathematicae
%D 1985
%P 339-364
%V 80
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1985__80_143234/
%F IM_1985__80_143234