Höser, Moritz, and Ulrike Schmalz. “SUPPORTING DOOR-TO-DOOR AIR TRAVEL: TOWARDS A PRIVACY PRESERVING VIRTUAL ASSISTANT FOR PASSENGERS”. Journal of Air Transport Studies 12, no. 1 (January 1, 2021): 25-60. Accessed October 7, 2022. https://jats.aviationsociety.gr/index.php/JATS/article/view/174.