Geodesic
Differentiation in metric spaces
Algebra i analiz, Tome 16 (2004) no. 6, pp. 128-161.

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Differentiation of Lipschitz maps between abstract metric spaces is discussed. Differentiability of isometries, first variation formula, and Rademacher-type theorems are studied.
Keywords: Alexandrov spaces, Rademacher theorem, variation formulas, tangent cones. 
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A. Lytchak. Differentiation in metric spaces. Algebra i analiz, Tome 16 (2004) no. 6, pp. 128-161. http://geodesic.mathdoc.fr/item/AA_2004_16_6_a4/

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