https://progressivepost.eu/can-we-have-a-political-debate-on-the-economic-union-we-want/
https://feps-europe.eu/news/friends-of-western-balkans-open-letter/
https://www.socialeurope.eu/wp-content/uploads/2019/10/Europe-2025-eBook.pdf
https://www.foreignaffairs.com/europe/promise-and-peril-eu-expansion