Rockel, P. [P:(DE-Juel1)VDB1347] ; Strube, F. [P:(DE-Juel1)VDB1600] ; Rockel, A. [P:(DE-Juel1)VDB7941] ; Wildt, J. [P:(DE-Juel1)VDB1780] ; Kaiser, W. [P:(DE-HGF)0]