@misc{indiciae6947dd4fc677,
  title = {[Direct fetal electrocardiogram recording].},
  author = {I Roszkowski and J Kretowicz and A Wichrzycki},
  year = {1968},
  url = {https://pubmed.ncbi.nlm.nih.gov/5670124/},
  note = {Source identifier: 5670124}
}