Rossi, Federica, and Rico Maggi. “Business Travel Decisions and High-Speed Trains: An Ordered Logit Approach”. REGION 6, no. 3 (December 20, 2019): 1-16. Accessed April 5, 2020. https://openjournals.wu-wien.ac.at/ojs/index.php/region/article/view/249.