@misc{indiciae62bc8d165ae0,
  title = {Problems associated with the rhythm method of contraception.},
  author = {E Eichner},
  year = {1972},
  doi = {10.1016/0002-9378(72)90582-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/4635732/},
  note = {Source identifier: 4635732}
}