@misc{indiciaec6e4f2092c89,
  title = {Demographic changes as a problem for social security systems.},
  author = {F Kaufmann and L Leisering},
  year = {1984},
  doi = {10.1111/j.1468-246x.1984.tb00839.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/12340591/},
  note = {Source identifier: 12340591}
}