https://www.esri.ie/system/files/publications/SUSTAT95_0.pdf
https://www.socialeurope.eu/2017/06/dispelling-creative-myths-lower-employment-protection/
https://www.ipg-journal.de/regionen/global/artikel/detail/vorbei-mit-der-freiwilligkeit-4508/
https://www.boeckler.de/fpdf/HBS-008373/p_wsi_report_77e_2022.pdf