L. Shi, H. Zhong, T. Xie, and M. Li. Proceedings of the 14th International Conference on Fundamental approaches to software engineering, page 416--431. (April 2011)
J. Li, P. Ren, Z. Chen, Z. Ren, T. Lian, and J. Ma. Proceedings of the 2017 ACM Conference on Information and Knowledge Management, page 1419--1428. New York, NY, USA, ACM Press, (2017)