@article{DAN_1957_117_4_a6,
     author = {S. M. Nikol'skii},
     title = {On a variation problem of {Hilbert}},
     journal = {Doklady Akademii Nauk},
     pages = {573--575},
     publisher = {mathdoc},
     volume = {117},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_117_4_a6/}
}