{. Dobrzański, and L. Kuzniarz. SAC '06: Proceedings of the 2006 ACM symposium on Applied computing, page 1273--1279. New York, NY, USA, ACM Press, (2006)
Y. Yu, Y. Wang, J. Mylopoulos, S. Liaskos, A. Lapouchnian, and J. Leite. RE '05: Proceedings of the 13th IEEE International Conference on Requirements Engineering (RE'05), page 363--372. Washington, DC, USA, IEEE Computer Society, (2005)