http://www.libdems.org.uk/brexit-challenge-justice#
https://www.euronews.com/2018/09/25/why-is-the-irish-border-issue-so-complex-euronews-answers
http://www.acea.be/uploads/publications/ACEA_position_paper-Brexit.pdf
https://bdi.eu/media/pressecenter/#/artikel/news/brexit-wirft-seine-schatten-voraus/