Haefs, R. [P:(DE-HGF)0] ; Schmitz-Eiberger, M. [P:(DE-HGF)0] ; Mainx, H.G. [P:(DE-HGF)0] ; Mittelstaedt, W. [P:(DE-Juel1)VDB1076] ; Noga, G. [P:(DE-Juel1)VDB28496]