Mertens, B. [P:(DE-Juel1)VDB6550] ; Docter, Jutta [P:(DE-Juel1)132083] ; Scholtyssik, K. [P:(DE-Juel1)VDB4059] ; Krotz, R. [P:(DE-HGF)0] ; Erkens, W. [P:(DE-Juel1)VDB6556] ; Mohr, B. [P:(DE-Juel1)132199] ; Frings, W. [P:(DE-Juel1)132108] ; Gutheil, I. [P:(DE-Juel1)132120] ; Dachsel, H. [P:(DE-Juel1)132079]