Singh, N. [P:(DE-HGF)0] ; Berns, A. E. [P:(DE-Juel1)129438] ; Hennecke, D. [P:(DE-HGF)0] ; Hörner, J. [P:(DE-HGF)0] ; Kördel, W. [P:(DE-HGF)0] ; Schäffer, A. [P:(DE-HGF)0]