https://policyscotland.gla.ac.uk/blog-sir-ivan-rogers-speech-text-in-full/
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_Brexit_customs_WEB.pdf
https://www.socialeurope.eu/2017/07/fallacies-brexit-personifying-countries-simplistic-polemics/
https://eupinions.eu/index.php?id=12463