http://www.voxeurop.eu/en/2017/eu-uk-relations-5120821
https://www.cer.eu/sites/default/files/insight_SL_5.11.19_2.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/780/780.pdf
https://bdi.eu/media/user_upload/20171005_Pressemitteilung_Brexit.pdf