%0 Journal Article %A James Arthur %T The L2-Lefschetz numbers of Hecke operators. %J Inventiones mathematicae %D 1989 %P 257-290 %V 97 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1989__97_2_143702/ %F IM_1989__97_2_143702