%0 Journal Article %A N. P. Kuptsov %T Kolmogorov estimates for derivatives in $L_2[0,\infty)$ %J Informatics and Automation %D 1975 %P 94-117 %V 138 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1975_138_a4/ %G ru %F TRSPY_1975_138_a4