M. Seenivasan, R. Ramesh, F. Patricia. “Single Server Queueing Model With Catastrophe, Restoration and Partial Breakdown”. Mathematical Statistician and Engineering Applications 71, no. 4 (September 26, 2022): 3661–3685. Accessed May 23, 2025. https://philstat.org/index.php/MSEA/article/view/929.