
https://theconversation.com/bulgaria-is-joining-the-euro-in-january-and-not-everyone-is-pleased-258626

https://www.ips-journal.eu/topics/european-integration/europes-south-on-the-path-to-recovery-5241/?utm_campaign=en_903_20210615&utm_medium=email&utm_source=newsletter

https://www.ecb.europa.eu/pub/pdf/other/ecb.escblegalconferenceproceedings201812.en.pdf