https://www.rand.org/pubs/research_reports/RR2200.html
http://www.cobcoe.eu/files/cobcoe-brexit-report-september-2017-e-Y4G2st.pdf
http://www.consilium.europa.eu//media/32504/xt21004-ad01re02en18.pdf
http://blogs.lse.ac.uk/brexit/2018/07/09/british-influence-in-brussels-had-been-far-greater-than-recognised/