Wagner, R. [P:(DE-HGF)0] ; Naumann, K.-H. [P:(DE-HGF)0] ; Mangold, A. [P:(DE-Juel1)VDB13551] ; Möhler, O. [P:(DE-HGF)0] ; Saathoff, H. [P:(DE-HGF)0] ; Schurath, U. [P:(DE-HGF)0]