https://www.socialeurope.eu/2017/07/european-energy-union-muddling/
https://onlinelibrary.wiley.com/doi/epdf/10.1111/1467-923X.13172
https://ecipe.org/wp-content/uploads/2023/04/ECI_23_OccasionalPaper_02-2023_LY04.pdf?_gl=1*1wcezzg*_ga*Mjc5MzQwNDM3LjE2ODEzMTkyMzk.*_up*MQ..*_ga_T9CCK5HNCL*MTY4MTMxOTIzOS4xLjAuMTY4MTMxOTIzOS4wLjAuMA..
https://dgap.org/system/files/article_pdfs/dgap-report-2023-01-EN-Rethinking%20EUs%20Eastern%20Enlargement_0.pdf