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.ipg-journal.de/regionen/global/artikel/detail/back-to-the-roots-4359/
http://www.assemblee-nationale.fr/15/dossiers/etat_service_societe_confiance.asp