https://big-europe.eu/publication/bringing-the-greater-european-family-together/download
http://www.ips-journal.eu/regions/europe/article/show/free-spirits-2331/
https://www.ips-journal.eu/index.php?id=293&L=0&tx_news_pi1%5Bnews%5D=4441&tx_news_pi1%5Bcontroller%5D=News&tx_news_pi1%5Baction%5D=detail&utm_source=newsletter&utm_medium=email&utm_campaign=en_795_20200619&cHash=4a94c3414a78c7b0fe54218cc7da088b
https://www.bertelsmann-stiftung.de/fileadmin/files/user_upload/EZ_Policy_Paper_Quo_vadis_Cohesion_Policy_2024_ENG.pdf