@misc{indiciae7048a7b4cc19,
  title = {A microprocessor-based cardiotachometer},
  author = {Donaldson, J. A. and Crosier, W. G.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800024574},
  note = {Source identifier: 19800024574}
}