%0 Journal Article
%A R. R. Akopyan
%T Best approximation of differentiation operators on the Sobolev class of functions analytic in a strip
%J Sibirskie èlektronnye matematičeskie izvestiâ
%D 2021
%P 1286-1298
%V 18
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SEMR_2021_18_2_a70/
%G ru
%F SEMR_2021_18_2_a70