%0 Journal Article
%A Ya. I. Rivkind
%T Letter to the editors of ``Uspekhi Mathematicheskikh Nauk''
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1960
%V 15
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1960_15_6_a21/
%G ru
%F RM_1960_15_6_a21