https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef19036en.pdf
http://www.acea.be/uploads/publications/ACEA_position_paper-Brexit.pdf
https://www.llri.lt/wp-content/uploads/2018/06/Labour-Migration_3.pdf
http://www.oecd.org/fr/emploi/emp/Editorial-and-executive-summary-FR.pdf