Frequency modulation of heart rate of increase low-frequency content of cardiovascular signals.

@article{Ringo1982FrequencyMO,
  title={Frequency modulation of heart rate of increase low-frequency content of cardiovascular signals.},
  author={John A. Ringo and Kenneth B. Campbell and Nils S. Peterson and Robert A. Baker},
  journal={IEEE transactions on bio-medical engineering},
  year={1982},
  volume={29 7},
  pages={537-41}
}