@misc{indiciaedf5dd4095e0f,
  title = {Microfilmed ECGs.},
  author = {R R Barr and M A Dunn and D Larson},
  year = {1970},
  url = {https://pubmed.ncbi.nlm.nih.gov/5434782/},
  note = {Source identifier: 5434782}
}