https://www.socialeurope.eu/romania-and-bulgaria-stuck-in-eus-second-tier
https://centreonconstitutionalchange.ac.uk/sites/default/files/2021-04/Union%20at%20the%20Crossroads.pdf
https://www.open.ac.uk/blogs/EUatOU/index.php/2024/01/25/retained-eu-law-is-dead-long-live-assimilated-law/