
https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know

https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/129/129.pdf

http://www.migrationobservatory.ox.ac.uk/resources/reports/unsettled-status-which-eu-citizens-are-at-risk-of-failing-to-secure-their-rights-after-brexit/