Eschweiler, D. [P:(DE-Juel1)VDB88214] ; Wagner, M. [P:(DE-HGF)0] ; Geimer, M. [P:(DE-Juel1)132112] ; Knüpfer, A. [P:(DE-HGF)0] ; Nagel, W. E. [P:(DE-HGF)0] ; Wolf, F. [P:(DE-Juel1)VDB1927]