Liu, Bing-Zheng, Ying-En Ge, Kai Cao, Xi Jiang, and Linyun Meng. “Optimizing Fares and Transfer Discounts for a Bus-Subway Corridor”. Transport 34, no. 6 (December 23, 2019): 672-683. Accessed November 9, 2024. https://jbem.vgtu.lt/index.php/Transport/article/view/11566.