Bauser, G. [P:(DE-HGF)0] ; Hendricks-Franssen, H.-J. [P:(DE-Juel1)138662] ; Stauffer, F. [P:(DE-HGF)0] ; Kaiser, H.P. [P:(DE-Juel1)VDB94964] ; Kuhlmann, U. [P:(DE-HGF)0] ; Kinzelbach, W. [P:(DE-HGF)0]