Xu, Fangjian
Tian, Xu
Yin, Feng
Zhao, Yongfang
Yin, Xuebo
Funding for this research was provided by:
National Natural Science Foundation of China (CN) (41430965 and 41106040)
Qingdao Science and Technology Development Plan Projects (13-1-4-197-jch)
Fundamental Research Fund for the Central Universities (14CX02038A and 12CX02003A)