@article{DAN_1987_294_5_a10,
     author = {V. N. Temlyakov},
     title = {On the widths of function classes},
     journal = {Doklady Akademii Nauk},
     pages = {1069--1072},
     year = {1987},
     volume = {294},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_5_a10/}
}