Gao, Z. [P:(DE-Juel1)161264] ; Haegel, F.-H. [P:(DE-Juel1)129465] ; Esser, O. [P:(DE-Juel1)129450] ; Zimmermann, Egon [P:(DE-Juel1)133962] ; Vereecken, H. [P:(DE-Juel1)129549] ; Huisman, J. A. [P:(DE-Juel1)129472]