@misc{indiciaeea44281414e9,
  title = {Contraception and infertility.},
  author = {K L Oldershaw and M Brudenell},
  year = {1972},
  doi = {10.1136/bmj.3.5827.637},
  url = {https://pubmed.ncbi.nlm.nih.gov/4262800/},
  note = {Source identifier: 4262800}
}