https://ec.europa.eu/commission/sites/beta-political/files/revised_withdrawal_agreement_including_protocol_on_ireland_and_nothern_ireland.pdf
http://cdn.budgetresponsibility.org.uk/July_2017_Fiscal_risks.pdf
https://centreforbrexitpolicy.org.uk/wp-content/uploads/2020/07/REPLACING-THE-WITHDRAWAL-AGREEMENT-How-to-ensure-the-UK-takes-back-control-on-exiting-the-transition-period-12-July-20.pdf