%0 Journal Article
%A D. A. Gudkov
%T Letter to the editors
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1975
%V 30
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1975_30_4_a26/
%G ru
%F RM_1975_30_4_a26