https://www.brookings.edu/wp-content/uploads/2020/03/Del-Negro-et-al-Conference-Draft.pdf
https://www.ceps.eu/system/files/CEPS%20-%20LINKEDIN%20study%20FINAL.pdf
https://www.etui.org/sites/default/files/2024-04/Benchmarking%20Working%20Europe%202024%20The%20ongoing%20quest%20for%20Social%20Europe_2024.pdf
http://library.fes.de/pdf-files/dialog/13464.pdf