Schepers, Paul, Marco Helbich, Marjan Hagenzieker, Bas de Geus, Marco Dozza, Niels Agerholm, Anna Niska, et al. “The Development of Cycling in European Countries since 1990”. European Journal of Transport and Infrastructure Research 21, no. 2 (May 18, 2021): 41–70. Accessed November 21, 2024. https://journals.open.tudelft.nl/ejtir/article/view/5411.