%0 Journal Article %A S. G. Krein %T Sixth Inter-College Physical and Mathematical Conference of the Far East %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1967 %V 22 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1967_22_1_a22/ %G ru %F RM_1967_22_1_a22