Guo, Junhua, Yutao Ye, and Yafeng Ma. “Route Selection and Distribution Cost of Express Delivery: An Urban Metro Network Based Study”. Promet - Traffic&Transportation 33, no. 2 (April 1, 2021): 283-296. Accessed April 23, 2024. http://traffic.fpz.hr/index.php/PROMTT/article/view/3592.