Rohrer, F. [P:(DE-Juel1)16347] ; Bohn, B. [P:(DE-Juel1)2693] ; Brauers, T. [P:(DE-Juel1)16306] ; Brüning, D. [P:(DE-Juel1)VDB4373] ; Johnen, F.-J. [P:(DE-Juel1)VDB21184] ; Wahner, A. [P:(DE-Juel1)16324] ; Kleffmann, J. [P:(DE-HGF)0]