Zhao, Yunpeng
Xiang, Wu
Ma, Ming
Zhang, Xiuzhi
Bao, Zhengyu
Xie, Shuyun
Yan, Sen
Funding for this research was provided by:
National Natural Science Foundation of China (41472316)
The Hebei Provincial Department of Finance (2121299)
Fundamental Research Funds for the Central University (CUG170104)
Article History
Received: 28 April 2019
Accepted: 29 July 2019
First Online: 13 August 2019