Wendland, F. [P:(DE-Juel1)VDB4997] ; Jahnke, C. [P:(DE-HGF)0] ; Kunkel, R. [P:(DE-Juel1)VDB4996] ; Meier, M. [P:(DE-HGF)0] ; Schmalenstroer, M. [P:(DE-HGF)0] ; Schütz, C. [P:(DE-Juel1)VDB61624] ; Voigt, H.-J. [P:(DE-HGF)0]