https://www.europarl.europa.eu/at-your-service/files/be-heard/eurobarometer/2019/parlemeter-2019/executive-summary/en-parlemeter-2019-executive-summary.pdf
https://www.otto-brenner-stiftung.de/fileadmin/user_data/stiftung/Aktuelles/AH93/AH_93_Haller_Web.pdf
https://blogs.lse.ac.uk/brexit/2020/02/28/fog-in-belfast-a-hundred-years-of-uneasiness-and-no-end-in-sight/