Haas, F. [P:(DE-HGF)0] ; Dickheuer, S. [P:(DE-Juel1)165722] ; Zellekens, P. [P:(DE-Juel1)145960] ; Rieger, T. [P:(DE-HGF)0] ; Lepsa, M. I. [P:(DE-Juel1)128603] ; Lüth, H. [P:(DE-Juel1)128608] ; Grützmacher, D. [P:(DE-Juel1)125588] ; Schäpers, Th [P:(DE-Juel1)128634]