@article{AM2_1994__48_2-3_137612,
     author = {Antonella Fiacca and Francesca Papalini},
     title = {On the continuity of midpoint hall convex set-valued functions.},
     journal = {Aequationes mathematicae},
     pages = {283--293},
     publisher = {mathdoc},
     volume = {48},
     number = {2-3},
     year = {1994},
     zbl = {0809.26011},
     url = {http://geodesic.mathdoc.fr/item/AM2_1994__48_2-3_137612/}
}