http://www.resolutionfoundation.org/app/uploads/2018/02/IC-international.pdf
https://www.theatlantic.com/international/archive/2021/09/afghanistan-brain-drain/619959/?utm_source=newsletter&utm_medium=email&utm_campaign=03%2F09%2F21
http://uk.reuters.com/article/uk-britain-eu-banking-idUKKBN17Q26A?il=0
https://www.un.org/esa/population/publications/migration/migration.htm