@misc{indiciaec9539b5cf1f3,
  title = {Developments in steroidal hormonal contraception.},
  author = {A Klopper},
  year = {1970},
  doi = {10.1093/oxfordjournals.bmb.a070741},
  url = {https://pubmed.ncbi.nlm.nih.gov/4312781/},
  note = {Source identifier: 4312781}
}