@misc{indiciae24fd99d00969,
  title = {Epidemiology and planning.},
  author = {J Ipsen},
  year = {1971},
  doi = {10.2190/eceb-5v6k-lta3-4f25},
  url = {https://pubmed.ncbi.nlm.nih.gov/4944453/},
  note = {Source identifier: 4944453}
}