@misc{indiciae4672853b2ad2,
  title = {Precision digital heart rate meter.},
  author = {G W James and M H Paul and H U Wessel},
  year = {1972},
  doi = {10.1152/jappl.1972.32.5.718},
  url = {https://pubmed.ncbi.nlm.nih.gov/5038864/},
  note = {Source identifier: 5038864}
}