
https://blogs.lse.ac.uk/europpblog/2023/09/15/what-unites-and-what-divides-poland/

https://ec.europa.eu/commission/presscorner/api/files/document/print/en/qanda_22_3802/QANDA_22_3802_EN.pdf

https://bellacaledonia.org.uk/2021/09/24/the-flemish-the-outliers-of-europes-independence-movements/