@misc{indiciae666dcd42609a,
  title = {ELECTROCARDIOGRAPHIC LEADS.},
  author = {R A HELM and T C CHOU},
  year = {1964},
  doi = {10.1016/0002-9149(64)90074-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/14206177/},
  note = {Source identifier: 14206177}
}