https://ec.europa.eu/commission/sites/beta-political/files/customs_controls_0.pdf
http://blogs.lse.ac.uk/brexit/2017/10/24/the-eu-isnt-protectionist-its-one-of-the-most-open-economies-in-the-world/
https://institute.global/insight/middle-east/assessing-israels-trade-its-arab-neighbours?utm_source=Institute+Interest&utm_campaign=591ede149a-EMAIL_CAMPAIGN_2018_03_28_COPY_01&utm_medium=email&utm_term=0_a778d447d9-591ede149a-65414641
http://www.coggs.polis.cam.ac.uk/news/forum-on-geopolitics-triple-bill-on-brexit