http://www.oxera.com/Latest-Thinking/Publications/Reports/2017/Brexit-ports.aspx
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/650455/customs_bill_white_paper_print.pdf
http://www.fdiintelligence.com/Locations/Europe/United-Kingdom/Brexit-the-UK-and-FDI-one-year-on?utm_campaign=Enews+June+2nd+issue&utm_source=emailCampaign&utm_medium=email&utm_content=
https://www.socialeurope.eu/wp-content/uploads/2019/01/03_Brexit_Kroeger.pdf