@misc{indiciaecfd124c7e99c,
  title = {A precision cardiotachometer and arrhythmia detector.},
  author = {R G Clark and R W Meyer},
  year = {1969},
  doi = {10.1152/jappl.1969.27.4.569},
  url = {https://pubmed.ncbi.nlm.nih.gov/5822568/},
  note = {Source identifier: 5822568}
}