
https://institutdelors.eu/wp-content/uploads/2021/10/BP_211006_La-primaute-du-droit-de-lUnion-europeenne_Omnes.pdf

https://blogs.lse.ac.uk/brexit/2019/10/09/northern-ireland-depends-on-the-eus-fluid-borders-for-survival/

https://www.socialeurope.eu/2017/07/what-can-we-learn-from-the-nordic-model/