%0 Journal Article
%A A. L. Rublev
%T On approximation of the differentiation operator over the class of twice differentiable functions in the space $L_2(0,\infty)$
%J Trudy Instituta matematiki i mehaniki
%D 1996
%P 162-170
%V 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TIMM_1996_4_a12/
%G ru
%F TIMM_1996_4_a12