About the Authors
- Rui Fan
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Affiliation State Key Laboratory of Software Development Environment, Beihang University, Beijing, P. R. China
- Jichang Zhao
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Affiliation School of Economics and Management, Beihang University, Beijing, P. R. China
- Yan Chen
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Affiliation State Key Laboratory of Software Development Environment, Beihang University, Beijing, P. R. China
- Ke Xu
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* E-mail: kexu@nlsde.buaa.edu.cn
Affiliation State Key Laboratory of Software Development Environment, Beihang University, Beijing, P. R. China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Performed the experiments: RF JZ YC. Analyzed the data: RF JZ YC. Wrote the paper: JZ KX. Designed the experiments: JZ RF KX. Prepared the figures: RF JZ YC.