Kunkel, R. [P:(DE-Juel1)VDB4996] ; Hannappel, S. [P:(DE-HGF)0] ; Voigt, H. J. [P:(DE-HGF)0] ; Wendland, F. [P:(DE-Juel1)VDB4997] ; Wolter, R. [P:(DE-HGF)0]