Geodesic
Symmetrically differentiable functions with a perfect set of nondifferentiability points
Matematičeskie zametki, Tome 38 (1985) no. 1, pp. 80-88.

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     author = {S. P. Ponomarev},
     title = {Symmetrically differentiable functions with a perfect set of nondifferentiability points},
     journal = {Matemati\v{c}eskie zametki},
     pages = {80--88},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_38_1_a9/}
}
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S. P. Ponomarev. Symmetrically differentiable functions with a perfect set of nondifferentiability points. Matematičeskie zametki, Tome 38 (1985) no. 1, pp. 80-88. http://geodesic.mathdoc.fr/item/MZM_1985_38_1_a9/