Bietenholz, W. [P:(DE-HGF)0] ; Eicker, N. [P:(DE-Juel1)132090] ; Frommer, A. [P:(DE-HGF)0] ; Lippert, Th. [P:(DE-Juel1)132179] ; Medeke, B. [P:(DE-HGF)0] ; Schilling, K. [P:(DE-HGF)0] ; Weuffen, G. [P:(DE-HGF)0]