%0 Journal Article
%A A. V. Kibenko
%A A. I. Perov
%T Second Voronezh Winter Mathematical School
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1968
%V 23
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1968_23_4_a16/
%G ru
%F RM_1968_23_4_a16