https://www.adimblog.com/wp-content/uploads/2022/12/5.-Romeo_Flussi_DEF.pdf
https://curia.europa.eu/jcms/upload/docs/application/pdf/2020-04/cp200040en.pdf
https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know
http://ourglobalfuture.com/wp-content/uploads/2017/05/Global-Future-The_case_for_immigration.pdf