http://www.epc.eu/documents/uploads/pub_7576_northernirelandandbrexit.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/640485/Technical_note_on_Functionality_and_Protocol_7.pdf
https://www.bloomberg.com/news/articles/2017-06-01/soros-says-brexit-may-last-5-years-and-cause-immense-damage?cmpid=BBBXT060217_BIZ&utm_medium=email&utm_source=newsletter&utm_term=170602&utm_campaign=brexit
http://www.nfuonline.com/assets/96747