http://www.economics-ejournal.org/economics/journalarticles/2017-4
https://www.gmfus.org/news/eu-enlargement-and-democracy
https://enlargement.ec.europa.eu/document/download/17115494-8122-4d10-8a06-2cf275eecde7_en?filename=ukraine-report-2025.pdf
https://www.brookings.edu/articles/what-is-at-stake-in-polands-election/