https://publications.parliament.uk/pa/cm201719/cmselect/cmintrade/520/520.pdf
https://www.socialeurope.eu/wp-content/uploads/2019/01/03_Brexit_Kroeger.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/638135/6.3703_DEXEU_Northern_Ireland_and_Ireland_INTERACTIVE.pdf
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/725288/The_future_relationship_between_the_United_Kingdom_and_the_European_Union.pdf