@misc{indiciae3f28d54236c5,
  title = {ECG file. The normal electrocardiogram.},
  author = {S Thomas},
  doi = {10.7748/ns.4.36.56.s55},
  url = {https://pubmed.ncbi.nlm.nih.gov/2112725/},
  note = {Source identifier: 2112725}
}