Rockstuhl, C. [P:(DE-HGF)0] ; Lederer, F. [P:(DE-HGF)0] ; Bittkau, K. [P:(DE-Juel1)130219] ; Beckers, T. [P:(DE-Juel1)VDB81477] ; Carius, R. [P:(DE-Juel1)VDB4964]