1. A. Al-Rawas and S. Easterbrook, "Communication problems in requirements engineering: a field study," Proceedings of the First Westminster Conference on Professional Awareness in Software Engineering, 1996, pp. 47-60,
2. J. Bhat, M. Gupta, and S. Murthy, "Overcoming requirements engineering challenges: Lessons from offshore outsourcing," IEEE Software, Sept./Oct. 2006, pp. 38-44.
3. B. Boehm and P. Gruenbacher, "Supporting collaborative requirements negotiation: The EasyWinWin approach," Proceedings International Conference on Virtual Worlds and Simulation, 2000.
4. B. W. Boehm, Software Engineering Economics. Prentice-Hall, Englewood Cliffs, NJ, 1981.
5. M. Geisser, A. Heinzl, T. Hildenbrand, and F. Rothlauf, "Verteiltes, internetbasiertes Requirements-Engineering," WIRTSCHAFTSINFORMATIK 49 (2007) 3, 2007, pp. 199–207.