https://publications.parliament.uk/pa/cm201719/cmselect/cmbeis/380/380.pdf
https://bdi.eu/media/user_upload/20171005_Pressemitteilung_Brexit.pdf
https://cer.org.uk/sites/default/files/bulletin_114_js_st_article1.pdf
http://www.ecfr.eu/page/-/Keeping_Europe_Safe_After_Brexit2.pdf