http://www.ecreu.com/pdfs/alternative-white-paper-presented-by-UK-%20citizens-in-europe.pdf
https://www.socialeurope.eu/romania-and-bulgaria-stuck-in-eus-second-tier
http://ec.europa.eu/eurostat/statistics-explained/index.php/Acquisition_of_citizenship_statistics
https://www.ips-journal.eu/topics/foreign-and-security-policy/political-settlement-first-refugee-return-second-6619/?utm_campaign=en_1086_20230404&utm_medium=email&utm_source=newsletter