Hempel, N. [P:(DE-HGF)0] ; Denecke, B. [P:(DE-HGF)0] ; Weis, J. [P:(DE-HGF)0] ; Müller, Frank [P:(DE-Juel1)131939] ; Walter, P. [P:(DE-HGF)0] ; Johnen, S. [P:(DE-HGF)0]