http://www.css.ethz.ch/content/dam/ethz/special-interest/gess/cis/center-for-securities-studies/pdfs/CSSAnalyse225-EN.pdf
https://www.slideshare.net/SITEStockholm/the-russian-economy-under-putin-91262698
http://www.ecfr.eu/page/-/EU_TURKEY_POWER_AUDIT.pdf
http://www.ecfr.eu/page/-/Keeping_Europe_Safe_After_Brexit2.pdf
https://sipri.org/sites/default/files/2017-12/sipriinsights1712_.pdf
https://www.slideshare.net/SITEStockholm/the-russian-economy-under-putin-91262698
https://www.gov.uk/government/speeches/commonwealth-has-key-role-to-play-in-the-bright-future-for-britain-article-by-boris-johnson
http://www.transfrontier.eu/regions/ireland-northern-ireland/
https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/780/780.pdf
http://www.dw.com/en/turkey-eu-relations-which-countries-are-for-or-against-turkish-accession/a-40381533