https://www.euronews.com/2018/09/25/why-is-the-irish-border-issue-so-complex-euronews-answers
http://fedtrust.co.uk/the-2017-general-election-a-mandate-for-brexit/
http://blogs.lse.ac.uk/brexit/2017/09/28/the-eu-referendum-was-gerrymandered/
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/637748/Future_customs_arrangements_-_a_future_partnership_paper.pdf