https://orcid.org/0000-0002-3062-3765
About the Authors
- Xinyu Han
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Roles Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft
Affiliation School of Mathematics and Statistics, Qingdao University, Qingdao, China
- Kai Song
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Roles Conceptualization, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Validation, Writing – original draft
* E-mail: ksong@qdu.edu.cn
Affiliation School of Mathematics and Statistics, Qingdao University, Qingdao, China
Competing Interests
The authors have declared that no competing interests exist.