@misc{indiciaec478940c5f8e,
  title = {Pacemaker vectorcardiography.},
  author = {A Castellanos and L Lemberg and L Salhanick and B V Berkovits},
  year = {1968},
  doi = {10.1016/0002-8703(68)90111-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/5635051/},
  note = {Source identifier: 5635051}
}