https://www.socialeurope.eu/2017/07/road-soft-brexit/
http://fedtrust.co.uk/views-from-the-federal-trust/free-movement-and-migration/
http://www.lawyersforbritain.org/eu-deal-financial-liabilities.shtml
https://blogs.lse.ac.uk/brexit/2021/05/17/brexit-is-a-political-ponzi-scheme/