https://ec.europa.eu/commission/sites/beta-political/files/customs_controls_0.pdf
http://ukandeu.ac.uk/an-utterly-pernicious-bill/
https://www.brookings.edu/blog/order-from-chaos/2017/11/15/the-new-geopolitics-of-trade-in-asia/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=58493399
https://www.thetimes.co.uk/edition/news/irish-want-sea-border-with-uk-after-brexit-lvb6n35fq