http://researchbriefings.files.parliament.uk/documents/CBP-7484/CBP-7484.pdf
https://www.tuc.org.uk/sites/default/files/Brexit%20Legal%20Opinion.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef22040en.pdf
https://www.boeckler.de/fpdf/HBS-008373/p_wsi_report_77e_2022.pdf