https://socialeurope.eu/brexit-why-does-northern-ireland-matter-so-much
http://www.ecfr.eu/article/commentary_the_brexit_threat_to_britains_defence_industry
https://www.fragomen.com/file/scottishfuturespdf
https://bdi.eu/media/user_upload/20171005_Pressemitteilung_Brexit.pdf