%0 Journal Article %A W. Casselman %T On Abelian Varieties with Many Endomorphisms and a Conjecture of Shimura's. %J Inventiones mathematicae %D 1971 %P 225-236 %V 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1971__12_142075/ %F IM_1971__12_142075