TY  - JOUR
AU  - Kazimierz Nikodem
TI  - On midpoint convex set-valued functions.
JO  - Aequationes mathematicae
PY  - 1987
SP  - 46
EP  - 56
VL  - 33
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM2_1987__33_137201/
ID  - AM2_1987__33_137201
ER  -