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 
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/
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     zbl = {0206.06602},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1970_11_4_a12/}
}
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[1] Z. ZAHORSKI: Sur la première dérivée. Trans. Amer. Math. Soc. 69 (1950), 1-54. | MR | Zbl

[2] J. S. LIPIŃSKI: Une propriété des ensembles ${f'(x)>a}$. Fund. Math. 42 (1955), 339-342. | MR