Xu, Ran
Wang, Yanrong
Wang, Wenbin
Ding, Yongxin
Funding for this research was provided by:
National Social Science Fund of China (16BJL076)
the Innovation Fund of North China University of Water Resources and Electric Power
Article History
Received: 13 July 2018
Accepted: 3 September 2018
First Online: 11 September 2018