@misc{indiciae019d273c39f2,
  title = {On future population.},
  author = {N Keyfitz},
  year = {1972},
  doi = {10.1080/01621459.1972.10482386},
  url = {https://pubmed.ncbi.nlm.nih.gov/12309295/},
  note = {Source identifier: 12309295}
}