@misc{indiciae764271460dca,
  title = {Cardiotachometer with linear beat-to-beat frequency response},
  author = {Deboo, G. J. and Pope, J. M. and Smith, D. B. D.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670000597},
  note = {Source identifier: 19670000597}
}