Shin, Kwangcheol, and Sangyong Han. “A Centroid-Based Heuristic Algorithm for the Capacitated Vehicle Routing Problem”. Computing and Informatics 30, no. 4 (January 26, 2012): 721–732. Accessed April 4, 2025. http://147.213.75.17/ojs/index.php/cai/article/view/192.