Schöning, M. J. [P:(DE-Juel1)128727] ; Hüllenkremer, B. [P:(DE-Juel1)VDB658] ; Glück, O. [P:(DE-Juel1)VDB2219] ; Lüth, H. [P:(DE-Juel1)VDB975] ; Emons, H. [P:(DE-Juel1)VDB350]