Sommerhage, F. [P:(DE-Juel1)VDB46736] ; Helpenstein, R. [P:(DE-Juel1)VDB56782] ; Rauf, A. [P:(DE-Juel1)VDB70820] ; Wrobel, G. [P:(DE-Juel1)VDB17030] ; Offenhäusser, A. [P:(DE-Juel1)128713] ; Ingebrandt, S. [P:(DE-Juel1)VDB5728]