1. Lamsweerde, A. Goal-oriented requirements engineering: a guided tour. In: Proc. Of the 5th IEEE Intl. Requirements Engineering Conf (RE’01), Washington, DC, USA, pp.249-263, 2001.
2. Clements, P. Northrop, L. Software Product Lines: practices and patterns. 1th ed, Adson-Wesley, 2002.
3. Czarnecki, K.; Eisenecker, U. Generative Programming: Methods, Tools, and Applications. Boston, MA: Addison-Wesley, 2000.
4. Borba, C. Silva C. A comparison of goal-oriented approaches to model software product lines variability. In: LNCS, vol. 5833, pp. 184-253, Springer-Verlag, 2009.
5. Maiden, N. Alexander, I. Scenarios, stories, use cases: through the systems development life-cycle. 1th ed, Wiley, 2004