https://www.boe.es/boe/dias/2021/12/30/pdfs/BOE-A-2021-21788.pdf
https://opportunityinsights.org/wp-content/uploads/2020/05/tracker_paper.pdf
https://www.etui.org/sites/default/files/2025-06/Non-standard%20and%20precarious%20work%20across%20Europe_2025.pdf
https://knowledge.wharton.upenn.edu/article/will-jobs-return/?utm_source=kw_newsletter&utm_medium=email&utm_campaign=2020-04-07