https://blogs.lse.ac.uk/brexit/2019/04/15/brexit-lessons-from-the-silesian-backstop-of-1919-25/
https://www.euronews.com/2018/09/25/why-is-the-irish-border-issue-so-complex-euronews-answers
http://www.lawsociety.org.uk/news/stories/leaving-in-an-orderly-fashion-our-approach-to-brexit/
https://infacts.org/fight-brexit-including-changing-mind/