https://www.adimblog.com/wp-content/uploads/2022/12/5.-Romeo_Flussi_DEF.pdf
https://www.ajot.com/news/the-brexit-checklist-where-the-u.k.-and-eu-currently-stand
http://ec.europa.eu/eurostat/statistics-explained/index.php/Acquisition_of_citizenship_statistics
https://www.aicgs.org/publication/refugees-terrorism-and-a-failing-security-architecture/