About the Authors
- Zheng Chang
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Contributed equally to this work with: Zheng Chang, Zhenjia Wang
Affiliation School of Mathematics, Shandong University, Jinan, Shandong, China
- Zhenjia Wang
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Contributed equally to this work with: Zheng Chang, Zhenjia Wang
Affiliation School of Mathematics, Shandong University, Jinan, Shandong, China
- Guojun Li
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* E-mail: guojunsdu@gmail.com
Affiliation School of Mathematics, Shandong University, Jinan, Shandong, China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: GL ZC. Performed the experiments: ZC ZW. Analyzed the data: ZC ZW. Wrote the paper: ZC. Revised the manuscript: GL.