@misc{indiciaeb97173d9defe,
  title = {Left ventricular wall motion assessed by using fixed external reference systems.},
  author = {B R Chaitman and J D Bristow and S H Rahimtoola},
  year = {1973},
  doi = {10.1161/01.cir.48.5.1043},
  url = {https://pubmed.ncbi.nlm.nih.gov/4270891/},
  note = {Source identifier: 4270891}
}