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 August 26, 2025. https://traffic2.fpz.hr/index.php/PROMTT/article/view/2923.