@misc{indiciaee85038e32f35,
  title = {Prototype ultrasonic instrument for quantitative testing},
  author = {Lynworth, L. C. and Dubois, J. L. and Kranz, P. R.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730000051},
  note = {Source identifier: 19730000051}
}