Schäfer, C. [P:(DE-Juel1)VDB8500] ; Faust, U. [P:(DE-Juel1)VDB103618] ; Kirchgeßner, N. [P:(DE-Juel1)VDB8902] ; Merkel, R. [P:(DE-Juel1)128833] ; Hoffmann, B. [P:(DE-Juel1)VDB27696]