https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1714en.pdf
https://www.esri.ie/system/files/publications/JR1.pdf
https://www.socialeurope.eu/employment-shifts-in-europe-during-the-recovery-three-little-noticed-trends
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1710en.pdf