@misc{indiciaed432a4195e7a,
  title = {Selective fecundability and contraceptive effectiveness.},
  author = {R G Potter and B McCann and J M Sakoda},
  year = {1970},
  url = {https://pubmed.ncbi.nlm.nih.gov/5535246/},
  note = {Source identifier: 5535246}
}