https://theconversation.com/eu-citizens-proposal-a-lawyer-examines-the-detail-80111
https://www.nmc.org.uk/globalassets/sitedocuments/other-publications/nmc-register-2013-2017.pdf
https://blogs.lse.ac.uk/brexit/2019/12/03/a-missed-opportunity-revisiting-the-euro-referendum-that-never-was-from-a-historical-perspective/
http://ukandeu.ac.uk/brexit-a-french-perspective/