http://www.irsd.be/website/images/livres/rmb/19/ed_19_art_16.pdf
https://voxeu.org/system/files/epublication/Economics%20of%20Brexit.pdf
https://www.rand.org/pubs/research_reports/RR1786.html
https://www.un.org/disarmament/wmd/nuclear/npt/text