AL-Hassany, Marwan. “Studying and Analyzing the Performance Efficiency of the Cranes at the Container Berths in the Port of Umm Qasr by Using Queuing Theory”. The Gulf Economist 39, no. 55 (June 1, 2023): 1–20. Accessed May 20, 2025. https://tge.uobasrah.edu.iq/index.php/tge/article/view/62.