Berns, A. E. [P:(DE-Juel1)129438] ; Philipp, H. [P:(DE-Juel1)VDB2349] ; Narres, H.-D. [P:(DE-Juel1)VDB1124] ; Burauel, P. [P:(DE-Juel1)VDB202] ; Vereecken, H. [P:(DE-Juel1)129549] ; Tappe, W. [P:(DE-Juel1)129545]