%0 Journal Article %A Richard Weiss %A John van Bon %T An existence lemma for groups generated by 3-transpositions. %J Inventiones mathematicae %D 1992 %P 519-534 %V 109 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1992__109_2_144031/ %F IM_1992__109_2_144031