@misc{indiciaed7e402f8c845,
  title = {Digital heart rate meter.},
  author = {E Emons and M E Conolly},
  year = {1971},
  doi = {10.1093/cvr/5.1.157},
  url = {https://pubmed.ncbi.nlm.nih.gov/5544953/},
  note = {Source identifier: 5544953}
}