Tariq Ahmad Koka, V. H. Badshah, and Riyaz Ahmad Shah. “Single and Multi Server Queuing Models: A Study”. International Journal of Mathematics And its Applications 5, no. 4 - D (December 1, 2017): 595–603. Accessed July 3, 2024. https://ijmaa.in/index.php/ijmaa/article/view/1313.