Ivarsen, Jan, Anne Christoffersen, y Jakob Steen Christensen. «Fremtidens Mobilitet – På Kort, Mellem Og Langt Sigt». Proceedings from the Annual Transport Conference at Aalborg University 25, no. 1 (diciembre 31, 2018). Accedido julio 3, 2024. https://journals.aau.dk/index.php/td/article/view/6049.