Javed, Yasir, Adnan Shahid Khan, Abdul Qahar, and Johari Abdullah. 2017. “EEoP: A Lightweight Security Scheme over PKI in D2D Cellular Networks”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC) 9 (3-11):99-105. https://jtec.utem.edu.my/jtec/article/view/3191.