http://www.ips-journal.eu/regions/europe/article/show/battle-of-the-bulldogs-2063/
http://europa.eu/rapid/press-release_MEMO-17-2001_en.htm
http://news.sky.com/story/theresa-may-theres-no-economic-case-for-breaking-up-the-uk-10787816
https://www.nao.org.uk/wp-content/uploads/2018/01/Implementing-the-UKs-exit-from-the-European-Union-the-Deparment-for-International-Trade.pdf