Möller, Hans Peter [P:(DE-HGF)0] ; Hüfner, Bernd [P:(DE-HGF)0] ; Keller, Erich [P:(DE-HGF)0] ; Ketteniß, Holger [P:(DE-HGF)0] ; Viethen, Heinz W. [P:(DE-HGF)0]