http://www.guengl.eu/news/article/gue-ngl-news/adoption-of-the-european-travel-information-and-authorisation-system-a-hidd
https://www.nao.org.uk/wp-content/uploads/2016/02/Managing-the-supply-of-NHS-clinical-staff-in-England.pdf
https://theconversation.com/migracion-expulsion-y-desplazamiento-asi-ha-sido-la-diaspora-palestina-215941