https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1747en.pdf
https://www.ilo.org/legacy/english/inwork/cb-policy-guide/declarationofPhiladelphia1944.pdf
https://www.socialeurope.eu/marrying-labour-flexibility-protection
http://invs.santepubliquefrance.fr/publications/etat_sante_2017/ESP2017_Ouvrage_complet_vdef.pdf