http://docs.dpaq.de/10395-0216-euco-conclusions.pdf
https://apps.eui.eu/EUI_API/EVENTSV2/Attachments/Index?id=22316
https://publications.parliament.uk/pa/cm201719/cmselect/cmworpen/848/848.pdf
http://blogs.lse.ac.uk/brexit/2017/09/28/the-eu-referendum-was-gerrymandered/