Herrmann, F. [P:(DE-HGF)0] ; Jahnke, C. [P:(DE-HGF)0] ; Jenn, F. [P:(DE-HGF)0] ; Kunkel, R. [P:(DE-Juel1)VDB4996] ; Voigt, H.-J. [P:(DE-Juel1)VDB16001] ; Wendland, F. [P:(DE-Juel1)VDB4997]