http://www.resolutionfoundation.org/app/uploads/2017/10/Changing-Lanes-3.pdf
http://www.fdf.org.uk/news.aspx?article=8062
https://ukandeu.ac.uk/why-david-cameron-called-the-2016-referendum/?mc_cid=dcb6ed542c&mc_eid=815b1928ec
https://www.iwh-halle.de/fileadmin/user_upload/publications/iwh_discussion_papers/iwh-discussion-paper_2019-04_Brautzsch_Holtemoeller.pdf