Chen, Yuting, Kurt Fuellhart, Shengrun Zhang, and Frank Witlox. “Airport Classification in Chinese Multi-Airport Regions: An Interaction Network Perspective Between Aviation and High-Speed Rail”. European Journal of Transport and Infrastructure Research 22, no. 2 (April 4, 2022): 1–21. Accessed November 19, 2024. https://dev.journals.open.tudelft.nl/ejtir/article/view/6043.