Yang, Zhongzhen, and Jiannan Cheng. “Optimization of Trip-End Networks and Ride Price for Express Coach Systems in the High-Speed Rail Era”. Promet - Traffic&Transportation 29, no. 6 (December 21, 2017): 581–592. Accessed February 7, 2026. https://traffic2.fpz.hr/index.php/PROMTT/article/view/2695.