@misc{indiciaef75909d6d810,
  title = {Ultrasonic spectrum analysis using frequency-tracked gated RF pulses},
  author = {Cantrell, J. H., Jr. and Heyman, J. S.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800051227},
  note = {Source identifier: 19800051227}
}