Ji, P, K J Chen, and Q P Yan. “A Mathematical Model for a Multi-Commodity, Two-Stage Transportation and Inventory Problem”. International Journal of Industrial Engineering: Theory, Applications and Practice 15, no. 3 (February 25, 2022): 278–285. Accessed June 19, 2026. https://www.ijietap.com/ijietap/index.php/ijie/article/view/142.