https://theconversation.com/eu-citizens-proposal-a-lawyer-examines-the-detail-80111
https://blogs.lse.ac.uk/brexit/2018/10/30/after-brexit-the-uk-should-be-able-to-re-enter-the-eu-if-it-wishes-to-do-so/
http://www.failteireland.ie/FailteIreland/media/WebsiteStructure/Documents/Brexit/Exchange-rate-impacts-Update-19th-June-2018.pdf?ext=.pdf
https://committees.parliament.uk/publications/30492/documents/175947/default/