%0 Journal Article %A Robert L. Jr. Griess %A A.J.E. Ryba %T Embeddings of U3 (8), Sz (8) and the Rudvalis group in algebraic groups of type E7. %J Inventiones mathematicae %D 1994 %P 215-242 %V 116 %N 1-3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1994__116_1-3_144188/ %F IM_1994__116_1-3_144188