%0 Journal Article %A A. A. Ivanov %T Geometric approach to the problem of uniqueness for sporadic %J Doklady Akademii Nauk %D 1991 %P 1043-1046 %V 316 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1991_316_5_a3/ %G ru %F DAN_1991_316_5_a3