
https://www.brookings.edu/blog/fixgov/2021/12/13/how-seriously-should-we-take-talk-of-us-state-secession/?utm_campaign=Governance%20Studies&utm_medium=email&utm_content=195742694&utm_source=hs_email

https://www.theguardian.com/politics/ng-interactive/2019/sep/02/a-typical-hour-in-the-life-of-the-irish-border?ncid=newsletter-ukThe%20Waugh%20Zone%20%20Mon%20Sept%202&utm_campaign=newsletter-The%20Waugh%20Zone%20%20Mon%20Sept%202

https://legrandcontinent.eu/fr/2022/10/31/une-conversation-avec-josep-borrell/