V. Rajam, and S. Uma. “Server-Vacation-Active Service-Break down and Repair-Equilibrium State Queuing Model”. Malaya Journal of Matematik 7, no. 04 (October 1, 2019): 871–876. Accessed November 4, 2024. https://www.malayajournal.org/index.php/mjm/article/view/1295.