https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1663en.pdf
http://researchbriefings.files.parliament.uk/documents/CBP-7484/CBP-7484.pdf
https://www.socialeurope.eu/2017/06/strange-non-death-almps/
https://www.boeckler.de/pdf/p_wsi_report_39e_2018.pdf