https://www.brookings.edu/wp-content/uploads/2020/03/Del-Negro-et-al-Conference-Draft.pdf
https://www.economiesuisse.ch/de/artikel/immerhin-zugang-zu-arbeitskraeften-aus-drittstaaten-gesichert
http://invs.santepubliquefrance.fr/publications/etat_sante_2017/ESP2017_Ouvrage_complet_vdef.pdf
http://The European Social Pillar – Towards An EU Minimum Wage Policy?