Weng, Tzu-Chun, and Chen-Te Hsu. 2020. “Optimal Managerial Decision Model in a Closed-Loop Supply Chain for a Retailer to Collect Used Products With Different Transfer Policy”. Journal of Research in Business, Economics and Management 14 (2), 2645-60. http://www.scitecresearch.com/journals/index.php/jrbem/article/view/1840.