https://www.socialeurope.eu/new-spo-leader-can-he-stem-the-far-right-surge
http://www.progressives-zentrum.org/wp-content/uploads/2018/10/Les-Oubliés-Entretiens-sur-les-terres-où-prospère-le-vote-extrême_Das-Progressive-Zentrum_Johannes-Hillje.pdf
https://blogs.lse.ac.uk/europpblog/2023/05/16/will-the-radical-right-confederation-emerge-as-kingmaker-after-this-years-polish-election/
https://www.coe.int/en/web/cepej/special-file-report-european-judicial-systems-cepej-evaluation-report-2022-evaluation-cycle-2020-data-