Memmesheimer, M. [P:(DE-Juel1)VDB1043] ; Jakobs, H. J. [P:(DE-Juel1)VDB682] ; Piekorz, G. [P:(DE-HGF)0] ; Ebel, A. [P:(DE-HGF)0] ; Kerschgens, M. [P:(DE-HGF)0] ; Friese, Z. W. [P:(DE-HGF)0] ; Feldmann, H. [P:(DE-HGF)0] ; Geiss, H. [P:(DE-Juel1)16201]