@misc{indiciaeb905e22805e2,
  title = {Use-effectiveness and client satisfaction in six centers teaching the Billings Ovulation Method.},
  author = {H Klaus and J M Goebel and B Muraski and M T Egizio and D Weitzel and R S Taylor and M U Fagan and K Ek and K Hobday},
  year = {1979},
  doi = {10.1016/0010-7824(79)90008-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/487811/},
  note = {Source identifier: 487811}
}