Hussain, A. ., S. . Nazeer, T. . Abdullah, B. . Yaseen, and A. . Salam. “Network Resilience in Multiprotocol Label Switching”. Journal of Asian Scientific Research, vol. 2, no. 4, Apr. 2012, pp. 221-7, https://archive.aessweb.com/index.php/5003/article/view/3345.