TY - JOUR AU - Nikodem, Kazimierz TI - On midpoint convex set-valued functions. JO - Aequationes mathematicae PY - 1987 VL - 33 SP - 46 EP - 56 KW - convexity; boundedness; measurability; continuity; set-valued functions; topological vector space UR - http://eudml.org/doc/137201 ER -