%0 Journal Article %A F.G. Timmesfeld %T Groups generated by k-root subgroups. %J Inventiones mathematicae %D 1991 %P 575-666 %V 106 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1991__106_1_143954/ %F IM_1991__106_1_143954