Bechthold, U. [P:(DE-HGF)0] ; Hagmann, Siegbert [P:(DE-Ds200)OR0416] ; Ullrich, J. [P:(DE-HGF)0] ; Bathelt, B. [P:(DE-HGF)0] ; Kraft, G. [P:(DE-Ds200)OR0636] ; Schmidt-Böcking, H. [P:(DE-HGF)0]