Jäger, W. [P:(DE-HGF)0] ; Speicker, E. [P:(DE-HGF)0] ; Hollensteiner, S. [P:(DE-HGF)0] ; Dietz, F. [P:(DE-HGF)0] ; Kipp, L. [P:(DE-HGF)0] ; Schroeder, H. [P:(DE-Juel1)VDB3130] ; Dahmen, U. [P:(DE-HGF)0] ; Sigle, W. [P:(DE-HGF)0]