@misc{mutualite-subsidiarite-et-solidarite,
  title   = {Modèles de solidarité de la sécurité sociale},
  author  = {Stüdli, Beat},
  year    = {2017},
  month   = {jun},
  url     = {https://www.histoiredelasecuritesociale.ch/articles/themes/grundlagen-und-konzepte/mutualite-subsidiarite-et-solidarite}
}