https://www.institute.global/insights/geopolitics-and-security/windsor-framework-what-has-been-agreed-and-what-it-means-northern-ireland-protocol
https://www.ippr.org/files/2017-09/cej-interim-report-summary-170911.pdf
https://ukandeu.ac.uk/wp-content/uploads/2021/06/EU-UK-2030-Report.pdf