@article{DAN_1966_167_3_a6,
     author = {S. L. Sobolev},
     title = {On the density of finite functions in $l_p^{(l)}$},
     journal = {Doklady Akademii Nauk},
     pages = {516--518},
     publisher = {mathdoc},
     volume = {167},
     number = {3},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_167_3_a6/}
}