Urban, Marcia, Annika Paul, and Mara Cole. “TOWARDS SEAMLESS PASSENGER TRANSPORT: PERFORMANCE OF INTERMODAL APPROACHES”. Journal of Air Transport Studies 8, no. 1 (January 1, 2017): 1-12. Accessed December 6, 2021. https://jats.aviationsociety.gr/index.php/JATS/article/view/37.