Stiebig, H. [P:(DE-Juel1)VDB5910] ; Büchner, H. [P:(DE-HGF)0] ; Bunte, E. [P:(DE-Juel1)156447] ; Mandryka, V. [P:(DE-HGF)0] ; Knipp, D. [P:(DE-HGF)0] ; Jäger, G. [P:(DE-HGF)0]