Duhnke, K. [P:(DE-HGF)0] ; Smit, Herman G.J. [P:(DE-Juel1)16203] ; Kley, Dieter [P:(DE-Juel1)16204] ; Marenco, A. [P:(DE-HGF)0] ; Speth, P. [P:(DE-HGF)0] ; Wefers, J. [P:(DE-HGF)0]