Zhou, Qi, Baohua Mao, Sairong Peng, Junsheng Huang, and Peining Tian. “Analysis of the Impacts of Passenger Demand on the Profitability of Different Types of Urban Rail Transit”. Promet - Traffic&Transportation 35, no. 1 (February 13, 2023): 71–86. Accessed November 23, 2024. https://traffic2.fpz.hr/index.php/PROMTT/article/view/215.