
https://www.gov.uk/government/speeches/pm-commons-statement-on-eu-reform-and-referendum-22-february-2016

https://bdi.eu/media/pressecenter/#/artikel/news/brexit-wirft-seine-schatten-voraus/

http://blogs.sussex.ac.uk/uktpo/files/2017/11/Briefing-Paper-11.pdf