Zimmermann, E. [P:(DE-Juel1)133962] ; Kemna, A. [P:(DE-HGF)0] ; Berwix, J. [P:(DE-Juel1)133866] ; Glaas, W. [P:(DE-Juel1)133890] ; Vereecken, H. [P:(DE-Juel1)129549]