Khaskheli, S. A. .; Kalwar, H. A. .; Kalwar, M. A. .; Marri, H. B. .; Khan, M. A. .; Nebhwani, M. . APPLICATION OF MULTI-SERVER QUEUING MODEL TO ANALYZETHE QUEUING SYSTEM OF OPD DURING COVOD-19 PANDEMIC: A CASE STUDY. CIBG 2021, 27, 1351-1367.