http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf
https://www.sfo.gov.uk/2018/03/22/sfo-recovers-4-4m-from-corrupt-diplomats-in-chad-oil-share-deal/
https://openknowledge.worldbank.org/bitstream/handle/10986/29498/9781464812521.pdf
https://ustr.gov/sites/default/files/files/Press/Reports/2018%20National%20Trade%20Estimate%20Report.pdf
http://www.elysee.fr/declarations/article/discours-du-president-de-la-republique-au-parlement-europeen/
https://www.timeshighereducation.com/fr/books/review-shadows-empire-anglosphere-british-politics-michael-kenny-and-nick-pearce-polity-press
https://www.opendemocracy.net/can-europe-make-it/nicola-bertoldi/will-mera25-bring-bright-day-that-greece-has-been-waiting-for?utm_source=Daily+Newsletter&utm_campaign=ce51c25549-DAILY_NEWSLETTER_MAILCHIMP&utm_medium=email&utm_term=0_717bc5d86d-ce51c25549-407405485
http://blogs.lse.ac.uk/brexit/2017/10/24/the-eu-isnt-protectionist-its-one-of-the-most-open-economies-in-the-world/
http://eurodad.org/files/pdf/58d39b90e6546.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18005en.pdf