http://www.unhcr.org/4963237411.pdf
http://www.euronews.com/2017/12/08/view-visegrad-nations-protect-the-eu-it-s-time-to-say-thanks-
http://www.migrationobservatory.ox.ac.uk/resources/reports/unsettled-status-which-eu-citizens-are-at-risk-of-failing-to-secure-their-rights-after-brexit/
https://migrationdataportal.org/blog/10-coolest-visualizations-migration-data?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=61078421