http://fedtrust.co.uk/views-from-the-federal-trust/free-movement-and-migration/
https://ukandeu.ac.uk/wp-content/uploads/2022/10/UKICE-Northern-Ireland-Protocol-Bill.pdf
http://www.niesr.ac.uk/sites/default/files/publications/NIESR%20EU2%20MIGRATION%20REPORT.pdf
http://www.bakermckenzie.com/-/media/files/insight/publications/brexit_tradeflows.pdf?la=en