About the Authors
- Xiao-Sheng Cheng
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Affiliations Department of Mathematics, Huizhou University, Huizhou, Guangdong, P.R. China, School of Mathematical Sciences, Xiamen University, Xiamen, Fujian, P.R. China
- Xian'an Jin
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* E-mail: xajin@xmu.edu.cn
Affiliation School of Mathematical Sciences, Xiamen University, Xiamen, Fujian, P.R. China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: XSC XJ. Performed the experiments: XSC XJ. Analyzed the data: XSC XJ. Contributed reagents/materials/analysis tools: XSC XJ. Wrote the paper: XSC XJ.