Necessary and sufficient conditions for differentiability in the sense of Belinskii
Doklady Akademii Nauk, Tome 323 (1992) no. 2, pp. 241-244.

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     author = {V. I. Ryazanov},
     title = {Necessary and sufficient conditions for differentiability in the sense of {Belinskii}},
     journal = {Doklady Akademii Nauk},
     pages = {241--244},
     publisher = {mathdoc},
     volume = {323},
     number = {2},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_323_2_a10/}
}
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V. I. Ryazanov. Necessary and sufficient conditions for differentiability in the sense of Belinskii. Doklady Akademii Nauk, Tome 323 (1992) no. 2, pp. 241-244. http://geodesic.mathdoc.fr/item/DAN_1992_323_2_a10/