https://www.ips-journal.eu/interviews/theres-a-broad-consensus-in-denmark-around-migration-7635/
http://library.fes.de/pdf-files/id/ipa/13354.pdf
https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know
https://www.aicgs.org/publication/refugees-terrorism-and-a-failing-security-architecture/