Kolmogorov estimates for derivatives in $L_2[0,\infty)$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Approximation of functions and operators, Tome 138 (1975), pp. 94-117.

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@article{TM_1975_138_a4,
     author = {N. P. Kuptsov},
     title = {Kolmogorov estimates for derivatives in $L_2[0,\infty)$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {94--117},
     publisher = {mathdoc},
     volume = {138},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1975_138_a4/}
}
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N. P. Kuptsov. Kolmogorov estimates for derivatives in $L_2[0,\infty)$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Approximation of functions and operators, Tome 138 (1975), pp. 94-117. http://geodesic.mathdoc.fr/item/TM_1975_138_a4/