https://institute.global/news/customs-and-exiting-european-union
https://www.opendemocracy.net/neweconomics/brexit-global-south-time-end-free-trade-imperialism/
https://hansard.parliament.uk/commons/2018-03-07/debates/65828E0C-3CC7-43AE-B5D2-B5F1B5D42A4C/EuropeanUnionCitizenship
https://ecipe.org/wp-content/uploads/2022/05/ECI_22_OccPaper_Defence_04_2022_LY10.pdf