A new concept of separation Reinhard Nehse — 1981 Commentationes Mathematicae Universitatis Carolinae
The Hahn-Banach property and equivalent conditions Reinhard Nehse — 1978 Commentationes Mathematicae Universitatis Carolinae
Separation of two convex sets by operators Karl-Heinz Elster; Reinhard Nehse — 1978 Commentationes Mathematicae Universitatis Carolinae