http://blogs.lse.ac.uk/politicsandpolicy/john-mills-ge2017/
https://www.sussex.ac.uk/webteam/gateway/file.php?name=briefing-paper-1.pdf&site=18
https://www.bloomberg.com/news/features/2017-06-02/u-k-election-brexit-tests-loyalties-in-labour-stronghold?cmpid=BBBXT060217_BIZ&utm_medium=email&utm_source=newsletter&utm_term=170602&utm_campaign=brexit
http://www.cer.eu/sites/default/files/bulletin_118_js-sl_article2.pdf