https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1714en.pdf
https://theconversation.com/us-and-european-economies-depend-heavily-on-immigrants-decades-of-data-reveal-just-how-much-261508
https://www.brookings.edu/blog/order-from-chaos/2018/07/31/its-time-for-the-united-states-and-europe-to-face-the-politics-of-cultural-displacement/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=64909281
https://wiiw.ac.at/employment-effects-of-offshoring-technological-change-and-migration-in-a-group-of-western-european-economies-impact-on-different-occupations-dlp-6500.pdf