About the Authors
- Gang wei Wang
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* E-mail: pukai1121@163.com
Affiliation School of Mathematics and Statistics, Beijing Institute of Technology, Beijing, PR China
- Tian zhou Xu
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Affiliation School of Mathematics and Statistics, Beijing Institute of Technology, Beijing, PR China
- Tao Feng
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Affiliation School of Electrical Engineering, Yanshan University, Qinhuangdao, PR China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Wrote the paper: GwW TzX TF.