Khaskheli, S. A. ., H. A. . Kalwar, M. A. . Kalwar, H. B. . Marri, M. A. . Khan, and M. . Nebhwani. “APPLICATION OF MULTI-SERVER QUEUING MODEL TO ANALYZETHE QUEUING SYSTEM OF OPD DURING COVOD-19 PANDEMIC: A CASE STUDY”. The Journal of Contemporary Issues in Business and Government, vol. 27, no. 5, Oct. 2021, pp. 1351-67, https://cibgp.com/au/index.php/1323-6903/article/view/2067.