
https://www.socialeurope.eu/brexit-shows-us-real-first-world-problems-look-like

http://fedtrust.co.uk/views-from-the-federal-trust/free-movement-and-migration/

https://ec.europa.eu/commission/sites/beta-political/files/revised_withdrawal_agreement_including_protocol_on_ireland_and_nothern_ireland.pdf