@misc{indiciaeeeea2cf535a2,
  title = {Factors affecting normal expectancy of conception.},
  author = {A F GUTTMACHER},
  year = {1956},
  doi = {10.1001/jama.1956.02970090081016},
  url = {https://pubmed.ncbi.nlm.nih.gov/13319020/},
  note = {Source identifier: 13319020}
}