Geodesic
On the first derivative of real functions (Preliminary communication)
Commentationes Mathematicae Universitatis Carolinae, Tome 11 (1970) no. 4, pp. 817-822.

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Classification : 26-40, 26A24, 26Axx 
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     author = {Preiss, David},
     title = {On the first derivative of real functions {(Preliminary} communication)},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {817--822},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1970},
     mrnumber = {0274669},
     zbl = {0206.06602},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1970__11_4_a12/}
}
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Preiss, David. On the first derivative of real functions (Preliminary communication). Commentationes Mathematicae Universitatis Carolinae, Tome 11 (1970) no. 4, pp. 817-822. http://geodesic.mathdoc.fr/item/CMUC_1970__11_4_a12/