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@article{AM2_1987__33_137201, author = {Kazimierz Nikodem}, title = {On midpoint convex set-valued functions.}, journal = {Aequationes mathematicae}, pages = {46--56}, publisher = {mathdoc}, volume = {33}, year = {1987}, zbl = {0639.39012}, url = {http://geodesic.mathdoc.fr/item/AM2_1987__33_137201/} }
Kazimierz Nikodem. On midpoint convex set-valued functions.. Aequationes mathematicae, Tome 33 (1987), pp. 46-56. http://geodesic.mathdoc.fr/item/AM2_1987__33_137201/