@misc{indiciae9b17d90d6b6f,
  title = {[Clinical and morphological studies on hormonal contraception with the sequential method].},
  author = {O Fettig and P Kopecky},
  year = {1968},
  url = {https://pubmed.ncbi.nlm.nih.gov/4098858/},
  note = {Source identifier: 4098858}
}