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

https://www.socialeurope.eu/europes-defence-crisis-why-more-spending-alone-will-not-keep-the-continent-safe

https://www.politicalcapital.hu/pc-admin/source/documents/zinc_revisionism_comparative.pdf