https://blogs.lse.ac.uk/brexit/2019/04/15/brexit-lessons-from-the-silesian-backstop-of-1919-25/
https://www.opendemocracy.net/uk/gavin-barker/brexit-means-progressive-alliances-or-corporate-absolutism?utm_source=Daily+Newsletter&utm_campaign=d40bbfc4f2-DAILY_NEWSLETTER_MAILCHIMP&utm_medium=email&utm_term=0_717bc5d86d-d40bbfc4f2-407405485
https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/129/129.pdf
http://www.libdems.org.uk/brexit-challenge-justice#