@article{DAN_1988_301_2_a7,
     author = {V. N. Temlyakov},
     title = {On estimates of $\epsilon$-entropy and widths of classes of},
     journal = {Doklady Akademii Nauk},
     pages = {288--291},
     publisher = {mathdoc},
     volume = {301},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_301_2_a7/}
}