%0 Journal Article
%A V. V. Arestov
%A R. R. Akopyan
%T Stechkin's problem on the best approximation of an unbounded operator by bounded ones and related problems
%J Trudy Instituta matematiki i mehaniki
%D 2020
%P 7-31
%V 26
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TIMM_2020_26_4_a0/
%G ru
%F TIMM_2020_26_4_a0