https://curia.europa.eu/jcms/upload/docs/application/pdf/2018-12/cp180187en.pdf
https://www.socialeurope.eu/2017/07/european-welfare-states-perform/
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/638135/6.3703_DEXEU_Northern_Ireland_and_Ireland_INTERACTIVE.pdf
https://sp-bpr-en-prod-cdnep.azureedge.net/published/2018/2/2/Common-UK-Frameworks-after-Brexit/SB%2018-09.pdf