Kunkel, R. [P:(DE-Juel1)VDB4996] ; Bogena, H. R. [P:(DE-Juel1)129440] ; Gömann, H. [P:(DE-Juel1)VDB27819] ; Kreins, P. [P:(DE-Juel1)VDB27820] ; Tetzlaff, B. [P:(DE-Juel1)129578] ; Wendland, F. [P:(DE-Juel1)VDB4997]