%0 Journal Article %A Y. Ihara %T On Galois representations arising from towers of coverings of P1 ... . %J Inventiones mathematicae %D 1986 %P 427-460 %V 86 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1986__86_143401/ %F IM_1986__86_143401