@misc{indiciaee0f684c4c4e5,
  title = {A grid for calculating vectorcardiographic loop areas.},
  author = {J Wartak},
  year = {1979},
  doi = {10.1016/s0022-0736(79)80013-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/512540/},
  note = {Source identifier: 512540}
}