%0 Journal Article %A A. A. Kirillov %T Second School-Seminar “Group Presentations and Their Applications” %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1976 %V 31 %N 2 %U http://geodesic.mathdoc.fr/item/RM_1976_31_2_a23/ %G ru %F RM_1976_31_2_a23