Stehr, Johannes [P:(DE-HGF)0] ; Knieling, Peter [P:(DE-HGF)0] ; Olschewski, Friedhelm [P:(DE-Juel1)177834] ; Mantel, Klaus [P:(DE-HGF)0] ; Kaufmann, Martin [P:(DE-Juel1)129128] ; Koppmann, Ralf [P:(DE-Juel1)16343]