https://blogs.lse.ac.uk/brexit/2019/04/15/brexit-lessons-from-the-silesian-backstop-of-1919-25/
https://institute.global/policy/three-years-brexit-casts-long-shadow-over-uk-economy?utm_campaign=37971-&utm_medium=email&utm_source=Institute%20Interests
https://ec.europa.eu/commission/sites/beta-political/files/seminar-20200114-lpf_en.pdf
http://fedtrust.co.uk/our-work-on-europe/brexit-heading-to-a-deal-or-no-deal-while-uk-politics-implodes/