https://institute.global/news/customs-and-exiting-european-union
https://www.eda.admin.ch/dam/dea/fr/documents/folien/Folien-Abkommen_fr.pdf
https://cerre.eu/wp-content/uploads/2024/01/CERRE.BOOK_.DMA_.17JAN.pdf
https://www.smmt.co.uk/wp-content/uploads/sites/2/1207-SMMT-position-on-UK-Brexit-negotiations.pdf