Kumar, Neeraj, and Savita. “Threshold-Based Recovery in Queue Theory: Addressing Server Breakdowns, Catastrophic Events, and Customer Reneging”. Journal of Reliability and Statistical Studies 17, no. 02 (February 18, 2025): 435–452. Accessed April 22, 2026. https://journals.riverpublishers.com/index.php/JRSS/article/view/26851.