Umbach, A. [P:(DE-HGF)0] ; Engel, T. [P:(DE-HGF)0] ; Bach, H.-G. [P:(DE-HGF)0] ; van Waasen, S. [P:(DE-Juel1)142562] ; Droge, E. [P:(DE-HGF)0] ; Strittmatter, A. [P:(DE-HGF)0] ; Ebert, W. [P:(DE-HGF)0] ; Passenberg, W. [P:(DE-HGF)0] ; Steingruber, R. [P:(DE-HGF)0] ; Schlaak, W. [P:(DE-HGF)0] ; Mekonnen, G.G. [P:(DE-HGF)0] ; Unterborsch, G. [P:(DE-HGF)0] ; Bimberg, D. [P:(DE-HGF)0]