https://publications.parliament.uk/pa/cm201719/cmselect/cmworpen/848/848.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmexeu/935/935.pdf
http://docs.dpaq.de/10395-0216-euco-conclusions.pdf
https://institute.global/sites/default/files/articles/Moving-On-How-the-British-Public-Views-Brexit-and-What-It-Wants-From-the-Future-Relationship-With-the-European-Union.pdf