Sodsoon, S., S. Uttra, and S. Sindhuchao. “An Ant Colony System (ACS) With a Hybrid Local Search to Solve Vehicle Routing Problems”. Engineering and Applied Science Research, vol. 43, no. 1, Jan. 2016, pp. 1-8, https://ph01.tci-thaijo.org/index.php/easr/article/view/33536.