https://bdi.eu/media/pressecenter/#/artikel/news/brexit-wirft-seine-schatten-voraus/
https://www.publications.parliament.uk/pa/cm201617/cmselect/cmwomeq/799/799.pdf
https://ukandeu.ac.uk/northern-irelands-vicious-cycle-of-governance-failure/
https://uk.reuters.com/article/uk-britain-eu-options/stairway-to-brexit-barnier-maps-out-uks-canadian-path-idUKKBN1ED23R