
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.parlament.cat/document/cataleg/48146.pdf

https://www.politico.eu/article/pedro-sanchez-spain-election-parliament-2023-catalan-independence/