De Oña, Rocío, Laura Eboli, and Gabriella Mazzulla. “Key Factors Affecting Rail Service Quality in the Northern Italy: A Decision Tree Approach”. Transport 29, no. 1 (March 31, 2014): 75–83. Accessed April 20, 2024. https://journals.vilniustech.lt/index.php/Transport/article/view/1848.