https://www.tandfonline.com/doi/epdf/10.1080/01402382.2023.2168945?needAccess=true&role=button
https://securingdemocracy.gmfus.org/wp-content/uploads/2020/08/ASD-Covert-Foreign-Money.pdf
https://www.brookings.edu/blog/order-from-chaos/2020/03/16/the-government-crisis-in-germanys-thuringia-is-over-except-it-isnt/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=84809588
https://www.senat.fr/fileadmin/Fichiers/Images/redaction_multimedia/2022/2022_Documents-PDF/20220317_ESSENTIEL_-_Cabinet_de_conseil.pdf