https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1747en.pdf
https://trade.ec.europa.eu/doclib/docs/2021/july/tradoc_159709.pdf
https://www.tuc.org.uk/sites/default/files/Brexit%20Legal%20Opinion.pdf
https://www.parlament.gv.at/ZUSD/PDF/Enquete_BR_Zukunftsstrategien_Armut_43_2018.pdf