@article{DAN_1992_326_1_a5,
     author = {V. O. Leont'ev},
     title = {Asymptotics of the approximation of differentiable functions by},
     journal = {Doklady Akademii Nauk},
     pages = {31--34},
     publisher = {mathdoc},
     volume = {326},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_326_1_a5/}
}