http://www.ecreu.com/pdfs/alternative-white-paper-presented-by-UK-%20citizens-in-europe.pdf
https://www.brookings.edu/blog/the-avenue/2017/08/03/u-s-immigration-levels-continue-to-fuel-most-community-demographic-gains/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=54956018
https://www.gisreportsonline.com/r/sweden-immigrants-crisis/
http://uk.reuters.com/article/us-britain-eu-negotiations-idUKKBN17R1XJ