https://www.politico.eu/article/the-uk-failed-10-year-bid-to-fix-the-brexit-border-northern-ireland/
http://ukandeu.ac.uk/brexit-a-french-perspective/
https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/9/9.pdf
https://www.politico.eu/article/9-slippery-brexit-pledges/?utm_source=POLITICO.EU&utm_campaign=39a5c3d811-EMAIL_CAMPAIGN_2019_11_01_05_51&utm_medium=email&utm_term=0_10959edeb5-39a5c3d811-190380769