https://scholar.princeton.edu/sites/default/files/mgilens/files/gilens_and_page_2014_-testing_theories_of_american_politics.doc.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/514/514.pdf
http://www.ipg-journal.de/regionen/europa/artikel/detail/ein-bisschen-mehr-als-freundschaft-2458/
http://www.morganstanley.com/ideas/global-trade-protectionism
https://www.bankofengland.co.uk/-/media/boe/files/financial-stability-paper/2018/mind-the-current-account-gap.pdf?la=en&hash=E4599C6878FBDC6480EABCC51A6A4419C963AD9F
http://elkodaily.com/news/national/govt-and-politics/us-releases-list-of-russian-oligarchs-political-figures/article_ed99a49f-0bc3-5116-b42c-21d4dcc66d55.html
http://www.assemblee-nationale.fr/15/dossiers/etat_service_societe_confiance.asp
https://www.wto.org/english/res_e/reser_e/ullbergpresentation_e.pdf
https://corporateeurope.org/power-lobbies/2017/12/big-business-brexit-corporate-interests-still-dominate-brexit-and-trade