@misc{indiciaecb5e2ca1e820,
  title = {On exercising the heart.},
  author = {G E Burch},
  year = {1973},
  doi = {10.1016/0002-8703(73)90435-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/4702669/},
  note = {Source identifier: 4702669}
}