https://dailynewshungary.com/mayors-of-v4-countries-capitals-sign-pact-of-free-cities/
https://ecfr.eu/publication/crisis-of-confidence-how-europeans-see-their-place-in-the-world/
http://www.epc.eu/documents/uploads/pub_7655_riseofpostnationaldemocracy.pdf
https://diem25.org/wp-content/uploads/2017/03/European-New-Deal-Complete-Policy-Paper.pdf