Li, Guo-dong
Wang, Le-le
Funding for this research was provided by:
National Natural Science Foundation of China (11461063)
Xinjiang University of finance postgraduate research innovation project (XJUFE2017K006)
Natural resources fund of Xinjiang Uygur autonomous region (2017D01A24)
Article History
First Online: 7 July 2018
Compliance with Ethical Standards
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: The authors declare that they have no conflict of interest.