Bakuli K, Pal M. A Two-Server Bulk Service Queuing Model with a Permanent Server and a Temporary Server on Hold . Thail. Stat. [Internet]. 2022 Jun. 29 [cited 2024 May 7];20(3):636-54. Available from: https://ph02.tci-thaijo.org/index.php/thaistat/article/view/246994