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

https://www.ecb.europa.eu/press/key/date/2017/html/ecb.sp170524.en.html

https://blogs.lse.ac.uk/europpblog/2023/09/15/what-unites-and-what-divides-poland/