
http://www.dw.com/en/turkey-eu-relations-which-countries-are-for-or-against-turkish-accession/a-40381533

https://blogs.lse.ac.uk/europpblog/2023/12/11/new-hopes-for-the-eu-enlargement-process/

http://www.cesifo-group.de/portal/page/portal/DocBase_Service/studien/Studie-2017-Felbermayr-etal-Brexit-79843.pdf