1. Lamsweerde A.v.: Goal-oriented requirements engineering: a guided tour. In: Proceedings of the Fifth IEEE International Symposium on Requirements Engineering pp. 249–262 (2001)
2. Lapouchnian A.: Goal-oriented requirements engineering: an overview of the current research. University of Toronto, vol. 32, (2005)
3. Mylopoulos, J., Chung, L., Nixon, B.: Representing and using nonfunctional requirements: a process-oriented approach. IEEE Trans. Software Eng. 18(6), 483–497 (1992)
4. Chung, L., Nixon B.A., Yu, E.J: Mylopoulos: Non-functional requirements in software engineering. Springer Science & Business Media (2012)
5. Dardenne, A., van Lamsweerde, A., Fickas, S.: Goal-directed requirements acquisition. Sci. Comput. Program. 20(1–2), 3–50 (1993)