
http://wir2018.wid.world/files/download/wir2018-summary-french.pdf

https://blogs.lse.ac.uk/europpblog/2021/10/28/what-explains-the-fragmentation-of-the-german-party-system/

https://www.socialeurope.eu/how-europes-political-parties-abandoned-openness-and-left-populism-to-fill-the-void