https://blogs.lse.ac.uk/brexit/2020/02/28/fog-in-belfast-a-hundred-years-of-uneasiness-and-no-end-in-sight/
https://visegradinsight.eu/moderate-reactivation-weimar-triangle/
http://www.ecfr.eu/page/-/ECFR-_245_-_Crisis_and_Cohesion_-_A_10_Year_Review_Janning_WEB.pdf