About the Authors

Qiuye Xia

Roles Conceptualization, Data curation, Formal analysis, Methodology, Writing – original draft, Writing – review & editing

Affiliation School of Mathematics and Statistics, Guizhou University, Guiyang, China

Xiaoling Qiu

Roles Funding acquisition, Investigation, Supervision, Writing – review & editing

xlqiu@gzu.edu.cn

Affiliation School of Mathematics and Statistics, Guizhou University, Guiyang, China

Competing Interests

The authors have declared that no competing interests exist.