@misc{indiciae94972bd4645a,
  title = {Farris' formula for predicting fertile days.},
  author = {R G POTTER},
  year = {1957},
  doi = {10.1101/sqb.1957.022.01.018},
  url = {https://pubmed.ncbi.nlm.nih.gov/13543718/},
  note = {Source identifier: 13543718}
}