https://www.eca.europa.eu/ECAPublications/RV-2023-04/RV-2023-04_EN.pdf
https://wiiw.ac.at/the-emissions-reduction-potential-for-freight-transport-on-a-high-speed-rail-line-along-the-european-silk-road-dlp-6635.pdf
https://cdn2.nextinpact.com/medias/rapport-villani-ia.pdf
https://www.nber.org/system/files/working_papers/w30028/w30028.pdf