http://www.cer.org.uk/sites/default/files/insight_js_st_9.6.17.pdf
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/761852/05_December-_EU_Exit_Attorney_General_s_legal_advice_to_Cabinet_on_the_Withdrawal_Agreement_and_the_Protocol_on_Ireland-Northern_Ireland.pdf
https://www.fragomen.com/file/scottishfuturespdf
https://infacts.org/brexit-britain-long-way-fall-touches-bottom/