R. Khatchadourian, P. Greenwood, A. Rashid, and G. Xu. Proceedings of the 2009 IEEE/ACM International Conference on Automated Software Engineering, page 575--579. Washington, DC, USA, IEEE Computer Society, (2009)
F. Ciravegna. Proceedings of the 17th international joint conference on Artificial intelligence - Volume 2, page 1251--1256. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (2001)