@misc{indiciae0318c8dab83e,
  title = {The postextrasystolic apexcardiogram.},
  author = {K B Desser and A Benchimol and J A Schumacher},
  year = {1973},
  doi = {10.1378/chest.64.6.747},
  url = {https://pubmed.ncbi.nlm.nih.gov/4128194/},
  note = {Source identifier: 4128194}
}