
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/

http://www.progressives-zentrum.org/wp-content/uploads/2018/03/The-Future-of-the-Visegrad-Group_2018_ebook.pdf

https://big-europe.eu/publication/bringing-the-greater-european-family-together/download