
http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6438&CESifoWP.search=+

https://visual.ons.gov.uk/commonwealth-trade-in-focus-as-uk-prepares-for-brexit/

https://www.euronews.com/2018/09/25/why-is-the-irish-border-issue-so-complex-euronews-answers