Zakalek, P. [P:(DE-Juel1)VDB90649] ; Rücker, U. [P:(DE-Juel1)VDB1360] ; Schumacher, D. [P:(DE-Juel1)VDB73944] ; Mattauch, S. [P:(DE-Juel1)130821] ; Brückel, T. [P:(DE-Juel1)130572]