http://euroefe.euractiv.es/1311_actualidad/4466026_la-ampliacion-de-la-ue-provoco-una-fuga-de-cerebros-de-este-a-oeste.html
https://www.socialeurope.eu/2017/06/theresa-mays-other-citizens-of-nowhere/
https://insightcrime.org/wp-content/uploads/2023/06/HGBF-US-Policy-OC-and-Migration-Policy-Brief-InSight-Crime-June-2023-FINAL-ENG.pdf