
https://www.socialeurope.eu/epc-an-idea-whose-time-has-not-come

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/nick-rider/catalonia-spain-referendum-there-is-more-than-one-nationalism-in-iberian-peninsula