http://www.rug.nl/research/portal/files/41711829/cesifo1_wp6448.pdf
https://www.niauk.org/media-centre/blog/uk-explore-retaining-membership-euratom/
https://hansard.parliament.uk/commons/2018-03-07/debates/65828E0C-3CC7-43AE-B5D2-B5F1B5D42A4C/EuropeanUnionCitizenship
https://www.socialeurope.eu/brexit-status-quo-ex-ante