Folkers, M. [P:(DE-Juel1)VDB405] ; Mentel, T. F. [P:(DE-Juel1)16346] ; Tillmann, R. [P:(DE-Juel1)5344] ; Henk, H. [P:(DE-Juel1)VDB593] ; Wahner, A. [P:(DE-Juel1)16324]