https://www.boeckler.de/pdf/p_imk_report_141e_2018.pdf
http://www.niesr.ac.uk/sites/default/files/publications/Facing%20the%20Future%20Tackling%20post-Brexit%20Labour%20and%20skills%20NIESR.CIPD_.pdf
https://www.imk-boeckler.de/fpdf/HBS-008792/p_imk_study_91_2024.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1663en.pdf