@misc{indiciae98a5229c7c27,
  title = {How birth control affects births.},
  author = {N Keyfitz},
  year = {1971},
  doi = {10.1080/19485565.1971.9987908},
  url = {https://pubmed.ncbi.nlm.nih.gov/5094431/},
  note = {Source identifier: 5094431}
}