@misc{indiciae6c892571c338,
  title = {Contraception--retrospect and prospect.},
  author = {M J Harper},
  year = {1977},
  doi = {10.1007/978-3-0348-7098-6\_4},
  url = {https://pubmed.ncbi.nlm.nih.gov/339271/},
  note = {Source identifier: 339271}
}