https://www.publications.parliament.uk/pa/ld201617/ldselect/ldeucom/116/116.pdf
https://ec.europa.eu/commission/sites/beta-political/files/draft_withdrawal_agreement.pdf
http://news.sky.com/story/theresa-may-theres-no-economic-case-for-breaking-up-the-uk-10787816
http://blogactiv.eu/blog/2012/05/15/stumbling-towards-the-brexit/