About the Authors

Jijun Zhao

jjzhao@qdu.edu.cn

Affiliation Institute of Complexity Science, Qingdao University, Qingdao, China

Xinmin Li

Affiliation School of Mathematics and Statistics, Qingdao University, Qingdao, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceptualization: JZ. Data curation: JZ. Formal analysis: JZ. Investigation: JZ. Methodology: JZ XL. Resources: JZ. Software: JZ. Supervision: JZ. Validation: JZ XL. Writing – original draft: JZ. Writing – review & editing: JZ XL.