https://www.bruegel.org/system/files/2024-05/WP%2013%202024.pdf
https://blogs.lse.ac.uk/europpblog/2023/09/15/what-unites-and-what-divides-poland/
http://www.assemblee-nationale.fr/15/propositions/pion0542.asp
https://www.opendemocracy.net/can-europe-make-it/patrice-de-beer/catalonia-now-what?utm_source=Daily+Newsletter&utm_campaign=0b1fe93b93-DAILY_NEWSLETTER_MAILCHIMP&utm_medium=email&utm_term=0_717bc5d86d-0b1fe93b93-407405485