Pitann, B. [P:(DE-HGF)0] ; Kranz, T. [P:(DE-HGF)0] ; Zörb, C. [P:(DE-HGF)0] ; Walter, A. [P:(DE-Juel1)VDB2595] ; Schurr, U. [P:(DE-Juel1)129402] ; Mühling, K.H. [P:(DE-Juel1)VDB101416]