https://blogs.lse.ac.uk/brexit/2021/02/04/indyref2-scottish-independence-would-be-2-3-times-more-costly-than-that-of-brexit-and-rejoining-the-eu-wouldnt-make-up-the-difference/
https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/fs-2022-rapport-soutenabilites-7mai-17h-final-synthese.pdf
https://www.socialeurope.eu/realising-europes-geopolitical-vocation#