http://www.ema.europa.eu/docs/en_GB/document_library/Press_release/2017/10/WC500236021.pdf
https://ec.europa.eu/commission/presscorner/detail/en/ip_20_181
https://blogs.lse.ac.uk/brexit/2021/02/04/indyref2-scottish-independence-would-be-2-3-times-more-costly-than-that-of-brexit-and-rejoining-the-eu-wouldnt-make-up-the-difference/
https://www.bloomberg.com/news/articles/2017-06-15/eu-citizens-want-a-brexit-style-vote-to-say-yes-to-staying?cmpid=BBBXT061617_BIZ&utm_medium=email&utm_source=newsletter&utm_term=170616&utm_campaign=brexit