%0 Journal Article %T Meetings of the Siberian Mathematical Society %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1983 %V 38 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1983_38_5_a28/ %G ru %F RM_1983_38_5_a28