Hikmaturokhman, A., Palupi, L. S., Amalia, N., Danisya, A. R., & Nugraha, T. A. (2018). 4G LTE Evolved Packet Core Planning with Call Switch Fallback Technology. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), 10(1-6), 133–136. Retrieved from https://jtec.utem.edu.my/jtec/article/view/3680