Pötting, K. [P:(DE-HGF)0] ; Luque, N.B. [P:(DE-HGF)0] ; Quaino, P.M. [P:(DE-HGF)0] ; Ibach, H. [P:(DE-Juel1)VDB5414] ; Schmickler, W. [P:(DE-HGF)0]