Balk, P. [P:(DE-82)108534] ; Fischer, M. [P:(DE-82)022251] ; Grundmann, Dirk [P:(DE-82)111108] ; Lückerath, Rainer [P:(DE-82)111109] ; Lüth, H. [P:(DE-82)006401] ; richter, W. [P:(DE-82)028797]