%0 Journal Article %A V. P. Kozyrev %A A. Ya. Petrenyuk %T Joint Seminar on Combinatorial Mathematics in Moscow State University %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1971 %V 26 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1971_26_3_a25/ %G ru %F RM_1971_26_3_a25