%0 Journal Article %A Alperin, Roger C. %T Platonic triangles of groups. %J Experimental mathematics %D 1998 %P 191-219 %V 7 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/EXMA_1998__7_3_226747/ %G en %F EXMA_1998__7_3_226747