@misc{indiciae9c2863012e18,
  title = {Microprocessor-controlled ultrasonic plethysmograph},
  author = {Bhagat, P. K. and Wu, V. C.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19800000500},
  note = {Source identifier: 19800000500}
}