https://ec.europa.eu/commission/sites/beta-political/files/customs_controls_0.pdf
https://www.brexitloket.nl/impactscan
https://ukandeu.ac.uk/destructive-ambiguity-northern-ireland-the-union-and-the-windsor-framework/
http://www.epc.eu/documents/uploads/pub_7788_whatnowoptionsforbrexit.pdf?cmpid=BBBXT061617_BIZ&utm_medium=email&utm_source=newsletter&utm_term=170616&utm_campaign=brexit