Rosendahl, I. [P:(DE-HGF)0] ; Siemens, J. [P:(DE-HGF)0] ; Groeneweg, J. [P:(DE-Juel1)129462] ; Linzbach, E. [P:(DE-HGF)0] ; Laabs, V. [P:(DE-HGF)0] ; Herrmann, C. [P:(DE-HGF)0] ; Vereecken, H. [P:(DE-Juel1)129549] ; Amelung, W. [P:(DE-HGF)0]