@misc{indiciae28936a27b5b2,
  title = {A multi-channel cathode-ray phonocardiograph.},
  author = {E M BESTERMAN and J K HARRIS},
  year = {1953},
  doi = {10.1136/hrt.15.2.130},
  url = {https://pubmed.ncbi.nlm.nih.gov/13041991/},
  note = {Source identifier: 13041991}
}