Kuhr, P. [P:(DE-Juel1)VDB72524] ; Kreins, P. [P:(DE-HGF)0] ; Kunkel, R. [P:(DE-Juel1)VDB4996] ; Voigt, H.J. [P:(DE-HGF)0] ; Wolter, R. [P:(DE-HGF)0] ; Vereecken, H. [P:(DE-Juel1)129549] ; Wendland, F. [P:(DE-Juel1)VDB4997]