%0 Journal Article %A Richard Weiss %A John van Bon %T A characterization of the groups Fi22, Fi23 and F24. %J Forum mathematicum %D 1992 %P 425-432 %V 4 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/FORUM_1992__4_6_141685/ %F FORUM_1992__4_6_141685