https://eupinions.eu/index.php?id=12463
https://institute.global/policy/three-years-brexit-casts-long-shadow-over-uk-economy?utm_campaign=37971-&utm_medium=email&utm_source=Institute%20Interests
http://www.automotivecouncil.co.uk/wp-content/uploads/sites/13/2017/06/Automotive-Council-UK-local-sourcing-content-research-2017-Final-1.pdf
https://blogs.lse.ac.uk/brexit/2019/10/09/northern-ireland-depends-on-the-eus-fluid-borders-for-survival/