%0 Journal Article
%A Yu. G. Borisovich
%A S. G. Krein
%T Sixth Voronezh Winter Mathematical School
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1972
%V 27
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1972_27_5_a30/
%G ru
%F RM_1972_27_5_a30