@article{DAN_1965_162_3_a6,
     author = {Yu. S. Nikol'skii},
     title = {On the theory of weight classes of differentiable functions of several variables and its applications to boundary problems for elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {510--512},
     year = {1965},
     volume = {162},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_162_3_a6/}
}