https://www.llri.lt/wp-content/uploads/2018/06/Labour-Migration_3.pdf
https://www.dw.com/en/swedens-population-shrinks-for-first-time-in-50-years/a-69893811
https://www.resolutionfoundation.org/app/uploads/2019/11/Feel-poor-work-more.pdf
https://www.un.org/esa/population/publications/migration/migration.htm