https://www.ft.com/content/b638551a-68c3-11e7-8526-7b38dcaef614
https://www.thetimes.co.uk/edition/news/irish-want-sea-border-with-uk-after-brexit-lvb6n35fq
http://blogs.sussex.ac.uk/uktpo/files/2017/11/Briefing-Paper-11.pdf
http://www.fdf.org.uk/news.aspx?article=7834