https://publications.parliament.uk/pa/cm201719/cmselect/cmniaf/329/329.pdf
http://docs.dpaq.de/10395-0216-euco-conclusions.pdf
https://institute.global/sites/default/files/articles/Fixing-the-Northern-Ireland-Protocol-A-Way-Forward.pdf
http://www.belfasttelegraph.co.uk/news/general-election-2017/comment/brexit-is-neither-a-partitionmaker-nor-a-partitionbreaker-that-decision-will-rest-with-northern-ireland-voters-35684229.html