@misc{indiciae967ae2e265ac,
  title = {Studies of electrocardiographic changes during exercise (modified double two-step test).},
  author = {P N G YU and A SOFFER},
  year = {1952},
  doi = {10.1161/01.cir.6.2.183},
  url = {https://pubmed.ncbi.nlm.nih.gov/14936213/},
  note = {Source identifier: 14936213}
}