Garside AK, Laili NR. A Cluster-First Route-Second Heuristic Approach to Solve The Multi-Trip Periodic Vehicle Routing Problem. JTI [Internet]. 2019 Aug. 31 [cited 2024 Nov. 24];20(2):172-81. Available from: https://ejournal.umm.ac.id/index.php/industri/article/view/8787