@misc{indiciaee9367ede3f48,
  title = {Electrically amplified precordial stethoscope.},
  author = {P Biro},
  year = {1994},
  doi = {10.1007/bf01618424},
  url = {https://pubmed.ncbi.nlm.nih.gov/7836978/},
  note = {Source identifier: 7836978}
}