Du, Mingxia
Zhang, Mingjun
Wang, Shengjie
Zhu, Xiaofan
Che, Yanjun
Funding for this research was provided by:
the National Natural Science Foundation of China (41161012)
the National Basic Research Program of China (2013CBA01801)
Foundation for Young Teachers of Northwest Normal University (NWNU-LKQN-15-8)