https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18032en.pdf
http://blogs.lse.ac.uk/brexit/2018/01/30/svexit-or-huxit-how-another-country-could-follow-the-uk-out-of-the-eu/
http://oegfe.at/wordpress/2017/05/oegfe-umfrage-oesterreicherinnen-wuenschen-sich-eine-flexible-und-effizientere-europaeische-union/
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