http://blogs.lse.ac.uk/brexit/2018/01/30/svexit-or-huxit-how-another-country-could-follow-the-uk-out-of-the-eu/
https://dailynewshungary.com/mayors-of-v4-countries-capitals-sign-pact-of-free-cities/
https://www.ips-journal.eu/topics/european-integration/orban-is-playing-the-long-game-7303/