Khatoon, A., Y. Hafeez, S. Asghar, and T. Ali. “AN ONTOLOGICAL FRAMEWORK FOR REQUIREMENT CHANGE MANAGEMENT IN DISTRIBUTED ENVIRONMENT”. The Nucleus, vol. 51, no. 2, Apr. 2014, pp. 291-0, http://thenucleuspak.org.pk/index.php/Nucleus/article/view/715.