Janssen, H. [P:(DE-Juel1)VDB3770] ; Emonts, B. [P:(DE-Juel1)129845] ; Groehn, H.-G. [P:(DE-Juel1)VDB2090] ; Heuts, H. [P:(DE-Juel1)VDB6124] ; Mai, H. [P:(DE-Juel1)VDB2094] ; Mergel, J. [P:(DE-Juel1)129888] ; Stolten, D. [P:(DE-Juel1)129928] ; Brocke, W. A. [P:(DE-Juel1)VDB2089]