https://www.nytimes.com/2017/05/29/opinion/britain-brexit-economy.html?_r=1
http://blogs.sussex.ac.uk/uktpo/files/2017/11/Briefing-Paper-11.pdf
http://news.sky.com/story/theresa-may-theres-no-economic-case-for-breaking-up-the-uk-10787816
https://cer.org.uk/sites/default/files/bulletin_114_js_st_article1.pdf