Girgis, E. [P:(DE-HGF)0] ; Schelten, J. [P:(DE-Juel1)VDB2184] ; Grünberg, P. A. [P:(DE-Juel1)VDB10459] ; Rottländer, P. [P:(DE-HGF)0] ; Kohlstedt, H. [P:(DE-Juel1)VDB3107]