@article{DAN_1961_141_2_a12,
     author = {N. P. Korneichuk},
     title = {Best uniform approximation of differentiable functions},
     journal = {Doklady Akademii Nauk},
     pages = {304--307},
     year = {1961},
     volume = {141},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_141_2_a12/}
}