Gao, Zhichao
Wang, Xiaosheng
Ha, Minghu
Funding for this research was provided by:
National Natural Science Foundation of China (No.61073121)
Natural Science Foundation of Hebei Province (No.F2012402037)
Natural Science Foundation of Hebei Province (No.G2013402063)
Social Science Foundation of Hebei Province (No.HB15GL119)