http://www.ecfr.eu/article/commentary_there_is_life_for_the_eu_after_brexit
https://www.bloomberg.com/news/articles/2019-09-11/world-s-oldest-customs-union-and-u-k-reach-a-post-brexit-deal
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
https://www.socialeurope.eu/2017/06/eu-fateful-year-2017/