@misc{indiciaebb09726dc5a5,
  title = {A rapid method for frontal plane axis determination in scalar electrocardiograms.},
  author = {S Laiken and N Laiken and R A O'Rourke and J S Karliner},
  year = {1973},
  doi = {10.1016/0002-8703(73)90167-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/4266821/},
  note = {Source identifier: 4266821}
}