@misc{indiciaeb848a9d7e09e,
  title = {The total QRS duration.},
  author = {H W BLACKBURN and E SIMONSON},
  year = {1957},
  doi = {10.1016/0002-8703(57)90339-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/13410783/},
  note = {Source identifier: 13410783}
}