@misc{indiciae6314962844de,
  title = {Instant electrocardiography. Use in cardiac exercise programs.},
  author = {J D Cantwell and G F Fletcher},
  year = {1974},
  doi = {10.1161/01.cir.50.5.962},
  url = {https://pubmed.ncbi.nlm.nih.gov/4430100/},
  note = {Source identifier: 4430100}
}