Lian, Jing
Ma, Yide
Ma, Yurun
Shi, Bin
Liu, Jizhao
Yang, Zhen
Guo, Yanan
Funding for this research was provided by:
National Natural Science Foundation of China (61175012, 61201422)
Natural Science Foundation of Gansu Province of China (148RJZA044)
Youth Foundation of Lanzhou Jiaotong University of China (2014005)