@misc{financing-and-calculation-models-in-old-age-and-survivors-insurance-ahv,
  title   = {Financing and Calculation Models in Old Age and Survivors’ Insurance (AHV)},
  author  = {Leimgruber, Matthieu},
  year    = {2015},
  month   = {jun},
  url     = {https://www.historyofsocialsecurity.ch/articles/topics/financing-models-and-calculation-methods/financing-and-calculation-models-in-old-age-and-survivors-insurance-ahv}
}