Geodesic
On Asymmetrical Derivates of Non-Differentiable Functions
Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 135-143

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Let ƒ(x) be a non-differentiable function, i.e. a realvalued continuous function denned on a linear interval which has nowhere a finite or infinite derivative. We shall say that ƒ(x) has symmetrical derivates at a point x if the four Dini derivates of ƒ(x) at x satisfy the relations and otherwise we shall say that ƒ(x) has asymmetrical dérivâtes at x. 
Garg, K. M. On Asymmetrical Derivates of Non-Differentiable Functions. Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 135-143. doi: 10.4153/CJM-1968-015-1
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