%0 Journal Article
%A P. L. Ul'yanov
%A Yu. V. Pokornyi
%A S. A. Shabrov
%T Voronezh Winter Mathematical School

%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 2005
%V 60
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_2005_60_3_a13/
%G ru
%F RM_2005_60_3_a13