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.politico.eu/article/eu-courts-western-balkans-as-russia-china-shadows-loom/
https://www.chba.org.uk/for-members/library/overseas-seminars/the-status-of-gibraltar-under-eu-law