https://www.socialeurope.eu/economic-sovereignty-delusion
https://www.gov.uk/government/speeches/pm-commons-statement-on-eu-reform-and-referendum-22-february-2016
https://ec.europa.eu/commission/sites/beta-political/files/joint_report.pdf
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_views-eu-27-v5_WEB.pdf