%0 Journal Article %T Meetings of the Moscow Mathematical Society %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1999 %P 1061-1067 %V 54 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1999_54_5_a23/ %G en %F RM_1999_54_5_a23