Kunkel, R. [P:(DE-Juel1)VDB4996] ; Tetzlaff, B. [P:(DE-Juel1)129578] ; Gömann, H. [P:(DE-HGF)0] ; Kreins, P. [P:(DE-HGF)0] ; Wendland, F. [P:(DE-Juel1)VDB4997]