@misc{indiciae85580fd41e1a,
  title = {Pacemaker 'heart sound'.},
  author = {A Harris},
  year = {1967},
  doi = {10.1136/hrt.29.4.608},
  url = {https://pubmed.ncbi.nlm.nih.gov/6029131/},
  note = {Source identifier: 6029131}
}