Hamdan, Nur Aaina Athira, and Siti Suhana Jamaian. “A Multi-Objectives Mathematical Model For Solving Industrial Hazardous Waste Location-Routing-Problem In Johor Region ”. Enhanced Knowledge in Sciences and Technology, vol. 1, no. 2, July 2021, pp. 40-50, https://publisher.uthm.edu.my/periodicals/index.php/ekst/article/view/2093.