%0 Journal Article
%A S. G. Krein
%T Fourth Voronezh Winter Mathematical School
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1970
%V 25
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1970_25_5_a23/
%G ru
%F RM_1970_25_5_a23