https://www.euronews.com/2018/09/25/why-is-the-irish-border-issue-so-complex-euronews-answers
https://www.nmc.org.uk/globalassets/sitedocuments/other-publications/nmc-register-2013-2017.pdf
http://www.oxera.com/Latest-Thinking/Publications/Reports/2017/Brexit-ports.aspx
https://socialeurope.eu/brexit-why-does-northern-ireland-matter-so-much