https://www.rand.org/pubs/research_reports/RR2200.html
https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/129/129.pdf
https://www.sbs.strath.ac.uk/economics/fraser/20171129/GMB-Brexit-report.pdf
https://onlinelibrary.wiley.com/doi/epdf/10.1111/jcms.13386