http://www.cer.eu/sites/default/files/pb_ireland_brexit_6.7.17.pdf
https://www.bloomberg.com/opinion/articles/2020-12-18/britain-and-europe-s-fish-fight-reveals-ultimate-brexit-truths
http://europa.eu/rapid/press-release_IP-18-463_en.htm
https://blogs.lse.ac.uk/brexit/2019/10/09/northern-ireland-depends-on-the-eus-fluid-borders-for-survival/