@article{DAN_1989_306_4_a0,
     author = {O. V. Davydov},
     title = {Asymptotic behavior of best approximations of individual functions},
     journal = {Doklady Akademii Nauk},
     pages = {777--781},
     publisher = {mathdoc},
     volume = {306},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_306_4_a0/}
}