On the geometric characterization of differentiability. I.
Commentationes Mathematicae Universitatis Carolinae, Tome 15 (1974) no. 3, pp. 521-540.

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Classification : 46G05, 47H99, 58C20
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Durdil, Jiří. On the geometric characterization of differentiability. I.. Commentationes Mathematicae Universitatis Carolinae, Tome 15 (1974) no. 3, pp. 521-540. http://geodesic.mathdoc.fr/item/CMUC_1974__15_3_a10/