
https://www.gov.uk/government/news/david-davis-opening-remarks-at-the-start-of-the-fourth-round-of-eu-exit-negotiations

https://www.publications.parliament.uk/pa/ld201617/ldselect/ldeucom/78/78.pdf

https://ukandeu.ac.uk/destructive-ambiguity-northern-ireland-the-union-and-the-windsor-framework/