Geodesic
Difference properties and differentiability of functions of several variables
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 4 
I. E. Gopengauz. Difference properties and differentiability of functions of several variables. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 4. http://geodesic.mathdoc.fr/item/RM_1973_28_4_a15/
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     title = {Difference properties and differentiability of functions of several variables},
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     url = {http://geodesic.mathdoc.fr/item/RM_1973_28_4_a15/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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[2] J. Marcinkiewicz, Collected papers, Warszawa, 1964 | MR | Zbl

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[4] M. Weiss, “On symmetric derivatives in $L^p$”, Studia Math., 24:1 (1964), 39–100 | MR

[5] Yu. A. Brudnyi, “Mnogomernyi analog odnoi teoremy Uitni”, Matem. sb., 82 (124):2 (1970), 175–191 | MR | Zbl