https://www.nytimes.com/2017/05/29/opinion/britain-brexit-economy.html?_r=1
http://www.iata.org/whatwedo/Documents/economics/impact_of_brexit.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/
https://institute.global/news/brexit-what-we-now-know