@misc{indiciae52580a9255d7,
  title = {The fetal electrocardiogram.},
  author = {M WONG and D E CASSELS},
  year = {1960},
  doi = {10.1001/archpedi.1960.02070030006002},
  url = {https://pubmed.ncbi.nlm.nih.gov/13845799/},
  note = {Source identifier: 13845799}
}