@article{DAN_1963_149_3_a4,
     author = {A. H. Gudiev},
     title = {A problem of {S.} {L.~Sobolev} and {S.} {M.~Nikolʹski\u{i}} for the limiting exponent},
     journal = {Doklady Akademii Nauk},
     pages = {509--512},
     year = {1963},
     volume = {149},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_3_a4/}
}