https://www.socialeurope.eu/brexit-shows-us-real-first-world-problems-look-like
https://www.cesifo-group.de/DocDL/ifoDD_18-01_03-09_Ochsner.pdf
http://ukandeu.ac.uk/an-utterly-pernicious-bill/
https://bdi.eu/media/user_upload/20171005_Pressemitteilung_Brexit.pdf