@misc{vecchiaia,
  title   = {Vecchiaia},
  author  = {Leimgruber, Matthieu and Stüdli, Beat and Zahn, Anina and Blatter, Bettina and Hartmann, Lukas},
  year    = {2026},
  month   = {jul},
  url     = {https://www.storiadellasicurezzasociale.ch/articoli/risikogeschichte/vecchiaia}
}