Li, Zhiguang
Ma, Xiaoyan
Guan, Xinghua
Qiang, Xiu
Zang, Duyang
Chen, Fang
Funding for this research was provided by:
NPU Foundation for Fundamental Research (3102014JCQ01089)
Natural Science Foundation of Shaanxi Province (2013JM2012)
National Natural Science Foundation of China (51372206)