
https://theconversation.com/why-the-eus-singapore-ruling-does-not-lead-to-a-smoother-brexit-road-for-britain-78116

http://blogs.sussex.ac.uk/uktpo/files/2017/11/Briefing-Paper-11.pdf

http://www.finfacts.ie/Irish_finance_news/articleDetail.php?Brexit-Northern-Ireland-s-industry-eclipsed-by-Republic-s-after-1961-803