@article{GDZPPN002036568,
title = {On midpoint convex set-valued functions.},
journal = {Aequationes mathematicae},
volume = {33},
year = {1987},
pages = {46-56},
zbl = {0639.39012},
url = {http://dml.mathdoc.fr/item/GDZPPN002036568}
}
Nikodem, Kazimierz. On midpoint convex set-valued functions.. Aequationes mathematicae, Tome 33 (1987) pp. 46-56. http://gdmltest.u-ga.fr/item/GDZPPN002036568/