%0 Journal Article %T Meetings of the Moscow Mathematical Society %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2000 %P 195-199 %V 55 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_2000_55_1_a17/ %G en %F RM_2000_55_1_a17