@misc{indiciaedb1a34f629e0,
  title = {A practical ultrasonic plethysmograph},
  author = {Wu, V. C. and Nickell, W. T. and Bhagat, P. K.},
  year = {1982},
  url = {https://ntrs.nasa.gov/citations/19820044951},
  note = {Source identifier: 19820044951}
}