Directional derivates and almost everywhere differentiability of biconvex and concave-convex operators.
Mathematica Scandinavica, Tome 57 (1985), pp. 215-224.

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Mots-clés : directional derivatives, almost everywhere differentiability, separately convex and concave-convex operators between topological vector spaces
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     title = {Directional derivates and almost everywhere differentiability of biconvex and concave-convex operators.},
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Mohamed Jouak; Lionel Thibault. Directional derivates and almost everywhere differentiability of biconvex and concave-convex operators.. Mathematica Scandinavica, Tome 57 (1985), pp. 215-224. http://geodesic.mathdoc.fr/item/MS2_1985__57_166950/