%0 Journal Article %A V. V. Arestov %T Best Uniform Approximation of the Differentiation Operator by Operators Bounded in the SpaceĀ $L_2$ %J Trudy Instituta matematiki i mehaniki %D 2018 %P 34-56 %V 24 %N 4 %U http://geodesic.mathdoc.fr/item/TIMM_2018_24_4_a2/ %G ru %F TIMM_2018_24_4_a2