@misc{indiciae2174bccc3f83,
  title = {The ventricular vector and polar gradient.},
  author = {Z Z Zao},
  year = {1967},
  doi = {10.1093/cvr/1.2.167},
  url = {https://pubmed.ncbi.nlm.nih.gov/6058853/},
  note = {Source identifier: 6058853}
}