Shibayama, Takeru, Fabian Sandholzer, Barbara Laa, and Tadej Brezina. “Impact of COVID-19 Lockdown on Commuting: A Multi-Country Perspective”. European Journal of Transport and Infrastructure Research 21, no. 1 (April 1, 2021): 70–93. Accessed October 22, 2021. https://journals.open.tudelft.nl/ejtir/article/view/5135.