http://voxeu.org/system/files/epublication/Brexit_Beckons_VoxEU.pdf
https://cepr.org/voxeu/columns/eus-strategic-dependencies-unveiled
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/