V. N. Rama Devi, Y. Saritha, K. Chandan,. “M/EK/1 Queueing System With Vacation, Two Types of Repair Facilities and Server Timeout”. International Journal of Advanced Science and Technology 29, no. 8s (April 21, 2020): 846 - 855. Accessed May 4, 2024. http://sersc.org/journals/index.php/IJAST/article/view/10832.