About the Authors
- Shuhua Chang
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* E-mail: shuhua55@126.com (SC); xywang1990@gmail.com (XW)
Affiliations Research Center for Mathematics and Economics, Tianjin University of Finance and Economics, Tianjin 300222, China, Institute of Policy and Management, Chinese Academy of Sciences, Beijing 100190, China
- Xinyu Wang
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* E-mail: shuhua55@126.com (SC); xywang1990@gmail.com (XW)
Affiliation Research Center for Mathematics and Economics, Tianjin University of Finance and Economics, Tianjin 300222, China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: SZ XW. Performed the experiments: SZ XW. Analyzed the data: SZ XW. Contributed reagents/materials/analysis tools: SZ XW. Wrote the paper: SZ XW.