https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/15/15.pdf
http://blogs.worldbank.org/developmenttalk/wto-s-trade-facilitation-agreement-and-doing-business-reforms-are-they-related-and-how
https://www.iai.it/sites/default/files/iai1910.pdf
https://hansard.parliament.uk/commons/2018-03-07/debates/65828E0C-3CC7-43AE-B5D2-B5F1B5D42A4C/EuropeanUnionCitizenship