https://frictions.co/english/linsoutenable-legerete-du-labeur/working-ourselves-clean/
https://www.boeckler.de/pdf/p_imk_report_141e_2018.pdf
https://ec.europa.eu/commission/priorities/deeper-and-fairer-economic-and-monetary-union/european-pillar-social-rights/european-pillar-social-rights-20-principles_en
http://www.ilo.org/wcmsp5/groups/public/—dgreports/—dcomm/—publ/documents/publication/wcms_548950.pdf