http://www.icaew.com/-/media/corporate/files/technical/economy/brexit/eu-exit-charge.ashx
http://www.ips-journal.eu/regions/global/article/show/brexit-but-what-about-africa-2199/
https://curia.europa.eu/jcms/upload/docs/application/pdf/2018-12/cp180187en.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/638958/Continuity_in_the_availability_of_goods_for_the_EU_and_the_UK_Position_Paper.pdf