@misc{indiciae866caa6777e0,
  title = {Vectorcardiographic notation.},
  author = {R A HELM},
  year = {1956},
  doi = {10.1161/01.cir.13.4.581},
  url = {https://pubmed.ncbi.nlm.nih.gov/13356414/},
  note = {Source identifier: 13356414}
}