http://fedtrust.co.uk/our-work-on-europe/hard-brexit-international-trade-and-the-wto-scenario/
https://blogs.lse.ac.uk/brexit/2019/10/23/long-read-the-makings-of-brexit-and-the-road-ahead/
http://www.nfuonline.com/assets/96747
http://bruegel.org/wp-content/uploads/2017/03/WP_2017_03-.pdf