%0 Journal Article %A W. Duke %T Hyperbolic distribution problems and half-integral weigth Maass forms. %J Inventiones mathematicae %D 1988 %P 73-90 %V 92 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1988__92_1_143559/ %F IM_1988__92_1_143559