Tang, Xuan, Ning Wang, Wen Chen, and Ying Wang. “Study on the Equilibrium of the Closed Loop Supply Chain Network Considering the Quality of Old Products Based on E-Commerce Opening up the Second Hand Market”. Frontiers in Economics and Management 7, no. 8 (August 10, 2026): 147–155. Accessed August 14, 2026. https://fieam.org/index.php/ojs/article/view/296.