https://bdi.eu/media/user_upload/20171005_Pressemitteilung_Brexit.pdf
http://cdn.budgetresponsibility.org.uk/July_2017_Fiscal_risks.pdf
https://ec.europa.eu/commission/sites/beta-political/files/aviation.pdf
http://news.sky.com/story/theresa-may-theres-no-economic-case-for-breaking-up-the-uk-10787816