Armstroff, A. [P:(DE-HGF)0] ; Wilkes, H. [P:(DE-Juel1)VDB1781] ; Horsfield, B. [P:(DE-Juel1)VDB651] ; Gieren, B. [P:(DE-HGF)0] ; Schwarzbauer, J. [P:(DE-HGF)0] ; Littke, R. [P:(DE-HGF)0]