https://www.wilsoncenter.org/blog-post/afghan-refugees-still-limbo
http://www.consilium.europa.eu/en/press/press-releases/2017/04/29-euco-brexit-guidelines/
https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know
https://www.cer.eu/sites/default/files/insight_JS_JP_17.1.23.pdf