Q. Zhang, W. Zheng, and M. Lyu. Fundamental Approaches to Software Engineering, volume 6603 of Lecture Notes in Computer Science, page 386--400. Springer, (2011)
H. Ma, H. Yang, I. King, and M. Lyu. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge mining, page 709--718. New York, NY, USA, ACM, (2008)