@article{DAN_1958_121_5_a6,
     author = {A. L. Krylov},
     title = {On a necessary and sufficient condition which can be used as a test that a given function belongs to the class $W_p^{(1)}$ of {Sobolev}},
     journal = {Doklady Akademii Nauk},
     pages = {795--796},
     publisher = {mathdoc},
     volume = {121},
     number = {5},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_5_a6/}
}