@article{DAN_1963_148_5_a1,
     author = {Yu. A. Brudnyi and B. D. Kotlyar},
     title = {The order of growth of $\varepsilon$-entropy on certain classes of functions},
     journal = {Doklady Akademii Nauk},
     pages = {1001--1004},
     year = {1963},
     volume = {148},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_148_5_a1/}
}