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
Doklady Akademii Nauk, Tome 121 (1958) no. 5, pp. 795-796.

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     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/}
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A. L. Krylov. 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. Doklady Akademii Nauk, Tome 121 (1958) no. 5, pp. 795-796. http://geodesic.mathdoc.fr/item/DAN_1958_121_5_a6/