https://blogs.lse.ac.uk/brexit/2018/10/30/after-brexit-the-uk-should-be-able-to-re-enter-the-eu-if-it-wishes-to-do-so/
http://www.finfacts.ie/Irish_finance_news/articleDetail.php?Brexit-Northern-Ireland-s-industry-eclipsed-by-Republic-s-after-1961-803
https://ec.europa.eu/commission/commissioners/2014-2019/andriukaitis/blog/likening-eu-ussr-not-unreasonable_en