@misc{indiciae462c14c6e64c,
  title = {Old age dependency in historical perspective.},
  author = {L Evans and J B Williamson},
  year = {1988},
  doi = {10.2190/r52w-d67y-7lwl-ecpj},
  url = {https://pubmed.ncbi.nlm.nih.gov/3073144/},
  note = {Source identifier: 3073144}
}