@misc{indiciae31a23ab9aaff,
  title = {Preamplifier circuit for heart rate meter.},
  author = {S N Tandon},
  year = {1980},
  doi = {10.1016/0141-5425(80)90153-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/7412253/},
  note = {Source identifier: 7412253}
}