Zimmermann, E. [P:(DE-Juel1)133962] ; Münch, H.-M. [P:(DE-Juel1)VDB17059] ; Berwix, J. [P:(DE-Juel1)133866] ; Glaas, W. [P:(DE-Juel1)133890] ; Meier, H. [P:(DE-Juel1)133914] ; Kemna, A. [P:(DE-Juel1)VDB736]