Blum, U. [P:(DE-HGF)0] ; Khosrawi, F. [P:(DE-HGF)0] ; Baumgarten, G. [P:(DE-HGF)0] ; Stebel, K. [P:(DE-HGF)0] ; Müller, R. [P:(DE-Juel1)129138] ; Fricke, K. H. [P:(DE-HGF)0]