Serial apexcardiograms and acute myocardial infarction.

@article{Baxter1977SerialAA,
  title={Serial apexcardiograms and acute myocardial infarction.},
  author={Richard H. G. Baxter and C D Thursfield},
  journal={Chest},
  year={1977},
  volume={72 3},
  pages={385}
}