%0 Journal Article %T Meetings of the Ural Mathematical Society %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1967 %V 22 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1967_22_6_a7/ %G ru %F RM_1967_22_6_a7