@misc{indiciae600a7f8f1e0b,
  title = {Differential vectorcardiography.},
  author = {Z Z Zao},
  year = {1971},
  doi = {10.1016/s0022-0736(71)80025-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/5157828/},
  note = {Source identifier: 5157828}
}