Bengel, Christopher [P:(DE-Juel1)188159] ; Gebregiorgis, C. [P:(DE-HGF)0] ; Menzel, Stephan [P:(DE-Juel1)158062] ; Waser, R. [P:(DE-Juel1)131022] ; Gaydadjiev, G. [P:(DE-HGF)0] ; Hamdioui, S. [P:(DE-HGF)0]