About the Authors
- Dayi He
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Affiliation School of Humanities & Economic Management, Lab of Resources & Environment Management, China University of Geosciences (Beijing), Beijing, P. R. China
- Ran Li
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Affiliation School of Humanities & Economic Management, Lab of Resources & Environment Management, China University of Geosciences (Beijing), Beijing, P. R. China
- Qi Huang
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Affiliation School of Humanities & Economic Management, Lab of Resources & Environment Management, China University of Geosciences (Beijing), Beijing, P. R. China
- Ping Lei
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* E-mail: leipingleiping@hotmail.com
Affiliation School of Humanities & Economic Management, Lab of Resources & Environment Management, China University of Geosciences (Beijing), Beijing, P. R. China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Analyzed the data: RL. Contributed to the writing of the manuscript: DH PL. Developed models: DH. Designed the numerical examples: QH.