
https://www.niesr.ac.uk/wp-content/uploads/2023/11/JC760-NIESR-Outlook-Autumn-2023-Global-Topical-Feature-v2.pdf

https://publications.parliament.uk/pa/cm201719/cmselect/cmhaff/421/421.pdf

http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf