%0 Journal Article %T Meetings of the Moscow Mathematical Society %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1963 %V 18 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1963_18_5_a28/ %G ru %F RM_1963_18_5_a28