S, Kalaiarasi, and Ayyappan G. “Flexible Group Service MAP/ PH/ 1 Queueing Model With Working Breakdown, Repair and Balking”. Pakistan Journal of Statistics and Operation Research 20, no. 4 (December 4, 2024): 615-632. Accessed May 23, 2025. https://pjsor.com/pjsor/article/view/4734.