Natnael Mekonenn, and Balasundaram. “Optimization of Vehicle Routing in Simultaneous Pickup and Delivery Service: A Case Study”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE 4, no. 12 (December 5, 2018): 72–80. Accessed April 25, 2024. https://ijasre.net/index.php/ijasre/article/view/804.