About the Authors
- Yan Xu
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* E-mail: xuyan@ustb.edu.cn
Affiliation Department of Information and Computer Science, University of Science and Technology Beijing, Beijing 100083, China
- Jun Ding
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Affiliation Department of Information and Computer Science, University of Science and Technology Beijing, Beijing 100083, China
- Ling-Yun Wu
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Affiliation Institute of Applied Mathematics, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190, China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: YX. Performed the experiments: YX JD. Analyzed the data: JD. Contributed reagents/materials/analysis tools: LYW. Wrote the paper: YX JD.