http://www.ips-journal.eu/regions/global/article/show/brexit-but-what-about-africa-2199/
https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/514/514.pdf
https://policyexchange.org.uk/wp-content/uploads/2017/06/Defying-Gravity-A-critique-of-estimates-of-the-economic-impact-of-Brexit.pdf