https://www.rand.org/pubs/research_reports/RR2200.html
https://publications.parliament.uk/pa/cm201719/cmselect/cmcumeds/365/365.pdf
http://www.conservativehome.com/parliament/2016/04/theresa-mays-speech-on-brexit-full-text.html
http://www.iata.org/whatwedo/Documents/economics/impact_of_brexit.pdf