%0 Journal Article
%T Meetings of the St.~Petersburg Mathematical Society
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 2009
%P 577-582
%V 64
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_2009_64_3_a8/
%G en
%F RM_2009_64_3_a8