https://socialeurope.eu/brexit-why-does-northern-ireland-matter-so-much
https://www.esri.ie/system/files/publications/RB202017_2.pdf
https://www.nao.org.uk/wp-content/uploads/2022/05/Regulating-after-EU-Exit.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