@misc{indiciaebe24354bab03,
  title = {Long-acting progestins--an update.},
  author = {K Singh and O A Viegas and S S Ratnam},
  year = {1989},
  doi = {10.1007/bf01890897},
  url = {https://pubmed.ncbi.nlm.nih.gov/2700422/},
  note = {Source identifier: 2700422}
}