https://www.etui.org/sites/default/files/2021-12/01-ETU%20BM2021-Small.pdf
https://www.esri.ie/system/files/publications/JR1.pdf
https://www.brookings.edu/research/is-long-covid-worsening-the-labor-shortage/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=200588850&utm_source=hs_email
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1663en.pdf