
http://www.epc.eu/documents/uploads/pub_7576_northernirelandandbrexit.pdf

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/643924/Foreign_policy__defence_and_development_paper.pdf

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