%0 Journal Article %A N. P. Kuptsov %T Kolmogorov estimates for derivatives in $L_2[0,\infty)$ %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1975 %P 94-117 %V 138 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1975_138_a4/ %G ru %F TM_1975_138_a4