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http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf
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https://www.open-britain.co.uk/new_research_trade_deals_with_five_key_countries_could_take_26_years_to_negotiate
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http://blogs.worldbank.org/developmenttalk/wto-s-trade-facilitation-agreement-and-doing-business-reforms-are-they-related-and-how
https://publications.parliament.uk/pa/cm201719/cmselect/cmintrade/520/520.pdf