https://www.nnfe.eu/what-more-can-be-done-tackle-migration-crisis
https://curia.europa.eu/jcms/upload/docs/application/pdf/2020-04/cp200040en.pdf
https://business-humanrights.org/sites/default/files/documents/fra-2017-opinion-01-2017-business-human-rights_en.pdf
http://www.migrationobservatory.ox.ac.uk/resources/reports/unsettled-status-which-eu-citizens-are-at-risk-of-failing-to-secure-their-rights-after-brexit/