
https://www.brookings.edu/articles/heres-why-us-africa-trade-under-agoa-has-been-successful-for-some-countries-but-not-others/

http://ecipe.org/publications/the-uks-first-international-trade-negotiation/?chapter=all

https://ec.europa.eu/commission/sites/beta-political/files/customs_controls_0.pdf