https://publications.parliament.uk/pa/cm201719/cmselect/cmniaf/329/329.pdf
http://www.cam.ac.uk/research/news/cognitive-flexibility-associated-with-voting-attitudes-in-eu-referendum-study-finds
https://www.rand.org/pubs/research_reports/RR2200.html
http://docs.dpaq.de/10395-0216-euco-conclusions.pdf