Spathara, D. [P:(DE-HGF)0] ; Sergeev, Dmitry [P:(DE-Juel1)159377] ; Kobertz, Dietmar [P:(DE-Juel1)129739] ; Müller, Michael [P:(DE-Juel1)129765] ; Putman, D. [P:(DE-HGF)0] ; Warnken, N. [P:(DE-HGF)0]