https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1708en.pdf
http://library.fes.de/pdf-files/iez/13375.pdf
http://uk2070.org.uk/wp-content/uploads/2020/02/UK2070-FINAL-REPORT.pdf
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IFGJ5327_Report_Brexit_Civil_Service_080317_WEB.pdf