Ganie, Shakir Majid, and P Manoharan. “Impatient Customers in an M/M/C Queue With Single and Multiple Synchronous Working Vacations”. Pakistan Journal of Statistics and Operation Research 14, no. 3 (September 22, 2018): 571-594. Accessed September 3, 2025. https://pjsor.com/pjsor/article/view/1866.