A systematization of convexity concepts for sets and functions. Breckner, Wolfgang W.; Kassay, Gábor — 1997 Journal of Convex Analysis
Stetigkeitsaussagen Für Eine Klasse Verallgemeinerter Konvexer Funktionen In Topologischen Linearen Räumen Wolfgang W. Breckner — 1978 Publications de l'Institut Mathématique
Characterizations of ultrabarrelledness and barrelledness involving the singularities of families of convex mappings. Wolfgang W. Breckner — 1996 Manuscripta mathematica