https://www.ipg-journal.de/interviews/artikel/die-gruene-falle-3380/
https://d1e00ek4ebabms.cloudfront.net/production/uploaded-files/2021%2011%2009%20Adenauer%20Stiftung%20speech_ENG_v5-7d1840b1-7b61-463e-ae23-ca7cbf13624e.pdf
https://www.gov.pl/web/primeminister/letter-from-prime-minister-mateusz-morawiecki-to-the-heads-of-governments-and-the-presidents-of-the-european-council-the-european-commission-and-the-european-parliament-on-relations-between-national-law-and-european-law
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