@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/}
}