
https://www.institutmontaigne.org/en/expressions/franco-german-couple-duo-duel-helm-european-union

http://blogs.lse.ac.uk/brexit/2017/08/11/book-review-shifting-baselines-of-europe/

https://blogs.lse.ac.uk/europpblog/2022/10/06/the-european-political-community-a-step-toward-differentiated-integration-in-europe/