Vereecken, H. [P:(DE-Juel1)129549] ; Lindenmayr, G. [P:(DE-HGF)0] ; Kuhr, A. [P:(DE-Juel1)23142] ; Welte, D. H. [P:(DE-HGF)0] ; Basermann, A. [P:(DE-HGF)0]