
https://publications.europa.eu/en/publication-detail/-/publication/506ecd7a-d51d-40cc-82f2-c8403ab57150

https://www.iwh-halle.de/fileadmin/user_upload/publications/gd/2022f/GD_F22_Langfassung_online.pdf

https://www.socialeurope.eu/2017/07/european-welfare-states-perform/