
https://wiiw.ac.at/the-long-way-round-lessons-from-eu-cee-for-improving-integration-and-development-in-the-western-balkans-dlp-6194.pdf

https://ec.europa.eu/commission/publications/position-paper-transmitted-eu27-goods-placed-market-under-union-law-withdrawal-date_en

https://dailynewshungary.com/mayors-of-v4-countries-capitals-sign-pact-of-free-cities/