Atiya Wardil *, Othman, and Samera Khaleel Ibrahim. “The Bi-Level Programming Approach to Improve the Inventory Control System With a Practical Application”. Journal of Economics and Administrative Sciences 30, no. 142 (September 6, 2024): 509–531. Accessed January 2, 2025. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/3433.