http://docs.dpaq.de/10395-0216-euco-conclusions.pdf
http://www.dw.com/en/turkey-eu-relations-which-countries-are-for-or-against-turkish-accession/a-40381533
https://www.bti-project.org/en/data/rankings/status-index/
https://www.niesr.ac.uk/wp-content/uploads/2023/11/JC760-NIESR-Outlook-Autumn-2023-Global-Topical-Feature-v2.pdf