
https://economy2030.resolutionfoundation.org/wp-content/uploads/2023/06/Trading-Up.pdf

https://blogs.lse.ac.uk/brexit/2019/10/09/northern-ireland-depends-on-the-eus-fluid-borders-for-survival/

https://ec.europa.eu/commission/sites/beta-political/files/seminar-20200114-lpf_en.pdf