Vonau, V. [P:(DE-HGF)0] ; Ahlborn, K. [P:(DE-HGF)0] ; Gerlach, F. [P:(DE-HGF)0] ; Iken, Heiko [P:(DE-Juel1)161164] ; Zander, Willi [P:(DE-Juel1)128648] ; Schubert, Jürgen [P:(DE-Juel1)128631] ; Schöning, Michael J. [P:(DE-Juel1)128727]