https://www.nnfe.eu/what-more-can-be-done-tackle-migration-crisis
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/766465/The-UKs-future-skills-based-immigration-system-print-ready.pdf
https://www.opendemocracy.net/en/can-europe-make-it/rest-and-west-thoughts-on-brexit-and-migration-part-one/
https://curia.europa.eu/jcms/upload/docs/application/pdf/2020-04/cp200040en.pdf