Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1975_138_a4, author = {N. P. Kuptsov}, title = {Kolmogorov estimates for derivatives in $L_2[0,\infty)$}, journal = {Informatics and Automation}, pages = {94--117}, publisher = {mathdoc}, volume = {138}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1975_138_a4/} }
N. P. Kuptsov. Kolmogorov estimates for derivatives in $L_2[0,\infty)$. Informatics and Automation, Approximation of functions and operators, Tome 138 (1975), pp. 94-117. http://geodesic.mathdoc.fr/item/TRSPY_1975_138_a4/