F. Solms. Proceedings of the South African Institute for Computer Scientists and Information Technologists Conference, page 363--373. New York, NY, USA, ACM, (2012)
Y. Chen, X. Li, L. Yi, D. Liu, L. Tang, and H. Yang. Software Engineering and Service Sciences (ICSESS), 2010 IEEE International Conference on, page 729 --733. (July 2010)