Wittlich, M. [P:(DE-Juel1)VDB28257] ; Koenig, B. W. [P:(DE-Juel1)132009] ; Stoldt, M. [P:(DE-Juel1)VDB21601] ; Schmidt, H. [P:(DE-HGF)0] ; Willbold, D. [P:(DE-Juel1)132029]