http://www.rug.nl/research/portal/files/41711829/cesifo1_wp6448.pdf
https://www.gov.uk/government/news/joint-article-a-deep-and-special-partnership
https://theconversation.com/mary-beard-is-right-roman-britain-was-multi-ethnic-so-why-does-this-upset-people-so-much-82269
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_Brexit_dispute_resolution_WEB.pdf