Li, Ruiyu [P:(DE-Juel1)168240] ; Cai, Yun [P:(DE-Juel1)168222] ; Reimer, Uwe [P:(DE-Juel1)6697] ; Wippermann, Klaus [P:(DE-Juel1)129946] ; Shao, Zhigang [P:(DE-HGF)0] ; Lehnert, Werner [P:(DE-Juel1)129883]