Geodesic
Local approximations and differentiability of functions of several variables
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 4 
Yu. A. Brudnyi. Local approximations and differentiability of functions of several variables. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 4. http://geodesic.mathdoc.fr/item/RM_1974_29_4_a9/
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     title = {Local approximations and differentiability of functions of several variables},
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