@misc{walther-stampfli,
  title   = {Walther Stampfli},
  author  = {Leimgruber, Matthieu},
  year    = {2014},
  month   = {jun},
  url     = {https://www.storiadellasicurezzasociale.ch/articoli/protagoniste-e-protagonisti/storia-della-sicurezza-sociale-consiglieri-federali/walther-stampfli}
}