@misc{indiciaeeaf88aa6cad4,
  title = {Esophageal stethoscope amplifier.},
  author = {R Douglass and B Doddapaneni},
  year = {1985},
  url = {https://pubmed.ncbi.nlm.nih.gov/3977102/},
  note = {Source identifier: 3977102}
}