Ahmad, S., I. E. A. Jalil, and S. S. Syed Ahmad. “An Enhancement of Software Requirements Negotiation With Rule-Based Reasoning: A Conceptual Model”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 8, no. 10, Dec. 2016, pp. 193-8, https://jtec.utem.edu.my/jtec/article/view/1394.