https://www.socialeurope.eu/2017/07/49234/
https://blogs.lse.ac.uk/brexit/2020/02/21/migration-how-scotland-hoped-to-do-things-differently/
https://ec.europa.eu/eurostat/web/products-eurostat-news/w/ddn-20250711-1
http://library.fes.de/pdf-files/bueros/budapest/15322-20190505.pdf