https://www.ifs.org.uk/publications/10302
https://unctad.org/news/post-brexit-uk-exports-could-fall-32-billion-due-non-tariff-measures-and-tariffs
https://www.opendemocracy.net/uk/peter-geoghegan/growing-up-on-border-on-brexit-s-irish-problem?utm_source=Daily+Newsletter&utm_campaign=b906170335-DAILY_NEWSLETTER_MAILCHIMP&utm_medium=email&utm_term=0_717bc5d86d-b906170335-407405485
http://www.cesifo-group.de/portal/page/portal/DocBase_Service/studien/Studie-2017-Felbermayr-etal-Brexit-79843.pdf