https://dailynewshungary.com/mayors-of-v4-countries-capitals-sign-pact-of-free-cities/
http://www.realclearworld.com/articles/2017/04/17/a_us-uk_trade_agreement_and_the_trump_re-election_campaign_112297.html
https://www.ips-journal.eu/topics/democracy-and-society/democracy-and-security-in-the-eus-neighbourhood-5750/?utm_campaign=en_979_20220301&utm_medium=email&utm_source=newsletter
http://www.cesifo-group.de/portal/page/portal/DocBase_Service/studien/Studie-2017-Felbermayr-etal-Brexit-79843.pdf