https://blogs.lse.ac.uk/brexit/2019/10/23/long-read-the-makings-of-brexit-and-the-road-ahead/
https://www.rand.org/pubs/research_reports/RR1786.html
http://www.cobcoe.eu/files/cobcoe-brexit-report-september-2017-e-Y4G2st.pdf
http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf