@misc{indiciae613df807afef,
  title = {An integrated-circuit heartrate indicator.},
  author = {A M Burbage},
  year = {1973},
  doi = {10.1007/bf02478154},
  url = {https://pubmed.ncbi.nlm.nih.gov/4697915/},
  note = {Source identifier: 4697915}
}