Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1992_323_2_a10, 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/} }
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/