@article{DAN_1991_319_1_a9,
     author = {S. M. Nikol'skii},
     title = {Approximation, on a manifold, of functions of {Besov} class by},
     journal = {Doklady Akademii Nauk},
     pages = {53--57},
     publisher = {mathdoc},
     volume = {319},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_1_a9/}
}