@misc{indiciae4d551797ca6e,
  title = {[Frequency analysis of heart sounds using a computer program].},
  author = {R Lippold and I Meier and P Hain and W Gieselmann and H von Egidy},
  year = {1974},
  url = {https://pubmed.ncbi.nlm.nih.gov/4454366/},
  note = {Source identifier: 4454366}
}