%0 Journal Article
%A A. P. Buslaev
%T On best approximation of the differentiation operator
%J Doklady Akademii Nauk
%D 1979
%P 1041-1044
%V 248
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a2/
%G ru
%F DAN_1979_248_5_a2