https://blogs.lse.ac.uk/brexit/2019/04/15/brexit-lessons-from-the-silesian-backstop-of-1919-25/
https://www.inquisitr.com/4784253/russian-media-interfered-in-the-uks-brexit-referendum-new-report-claims/
https://www.nmc.org.uk/globalassets/sitedocuments/other-publications/nmc-register-2013-2017.pdf
http://www.iata.org/whatwedo/Documents/economics/impact_of_brexit.pdf