https://www.cesifo-group.de/DocDL/ifoDD_18-01_03-09_Ochsner.pdf
http://www.parliament.uk/documents/commons-committees/Exiting-the-European-Union/17-19/Cross-Whitehall-briefing/EU-Exit-Analysis-Cross-Whitehall-Briefing.pdf
http://www.pircenter.org/en/news/6973-1224507
http://www.reuters.com/article/us-britain-eu-verhofstadt-idUSKBN19V0WP