USING WAITING LINES THEORY TO SOLVE THE PROBLEM OF WAITING A CASE STUDY IN THE NATIONAL BANK OF IRAQ. Wor.econo. and fin. Bul. [Internet]. 2023 Feb. 22 [cited 2026 Mar. 31];19:183-91. Available from: https://scholarexpress.net/index.php/wefb/article/view/2247