Afzal, H., M. R. Mufti, K. T. Ahmed, M. Rehman, M. Yousaf, and D. Qaseem. “Performance Modeling and Analysis of Secure Registration Process of CPEs in IEEE 802.22 WRAN Cognitive Radio Network”. The Nucleus, vol. 57, no. 4, Sept. 2021, pp. 141-9, http://thenucleuspak.org.pk/index.php/Nucleus/article/view/1180.