http://www.epc.eu/documents/uploads/pub_7865_realitybites.pdf
https://ec.europa.eu/commission/sites/beta-political/files/use-data-protection-information_en.pdf
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_Brexit_customs_WEB.pdf
https://ec.europa.eu/commission/sites/beta-political/files/joint_report.pdf