Li, Chengliang [P:(DE-Juel1)129497] ; Schäffer, Andreas [P:(DE-HGF)0] ; Vereecken, Harry [P:(DE-Juel1)129549] ; Heggen, Marc [P:(DE-HGF)0] ; Ji, Rong [P:(DE-HGF)0] ; Klumpp, Erwin [P:(DE-Juel1)129484]