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://rusi.org/sites/default/files/briefingpaper-france-uk-2017.pdf
http://www.voxeurop.eu/en/2017/eu-uk-relations-5120821