Pikkala, V.L. and Kassahun, W. (2019) “Discrete Time Analysis of Multi-Server Queueing System with Multiple Working Vacations and Reneging of Customers‎”, International Journal of Mathematical Modelling & Computations, 9(1), pp. 1–15. Available at: http://oiccpress.com/ijm2c/article/view/11309 (Accessed: 9 May 2026).