http://www.epc.eu/documents/uploads/pub_7576_northernirelandandbrexit.pdf
https://blogs.lse.ac.uk/brexit/2021/05/17/brexit-is-a-political-ponzi-scheme/
https://publications.parliament.uk/pa/cm201719/cmselect/cmintrade/520/520.pdf
https://www.esri.ie/system/files/publications/SUSTAT117.pdf