%0 Journal Article %A V. V. Arestov %A M. A. Filatova %T On the approximation of the differentiation operator by linear bounded operators on the class of twice differentiable functions in the space $L_2(0,\infty)$ %J Trudy Instituta matematiki i mehaniki %D 2012 %P 35-50 %V 18 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMM_2012_18_4_a3/ %G ru %F TIMM_2012_18_4_a3