https://wiiw.ac.at/outlier-or-not-the-ukrainian-economy-s-preparedness-for-eu-accession-dlp-6704.pdf
https://www.ips-journal.eu/index.php?id=340&L=0&tx_news_pi1%5Bnews%5D=3569&tx_news_pi1%5Bcontroller%5D=News&tx_news_pi1%5Baction%5D=detail&cHash=d26f1f115fd9e4efe0c4ae0efcba57a2
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://theconversation.com/investidura-o-bloqueo-y-vuelta-a-las-urnas-a-que-se-va-a-enfrentar-espana-210241