@misc{indiciae938549ff7a68,
  title = {3-D Surface Depression Profiling Using High Frequency Focused Air-Coupled Ultrasonic Pulses},
  author = {Roth, Don J. and Kautz, Harold E. and Abel, Phillip B. and Whalen, Mike F. and Hendricks, J. Lynne and Bodis, James R.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/19990047656},
  note = {Source identifier: 19990047656}
}