Maiti, Tarun, and Bibhas Chandra Giri. “A Two-Echelon Supply Chain Model With Time-Varying Selling Price and Demand Rate”. International Journal of Industrial Engineering: Theory, Applications and Practice 26, no. 6 (January 5, 2020). Accessed April 26, 2026. https://ijietap.com/index.php/ijie/article/view/2106.