TY  - RPRT
TI  - 3-D Surface Depression Profiling Using High Frequency Focused Air-Coupled Ultrasonic Pulses
AU  - Roth, Don J.
AU  - Kautz, Harold E.
AU  - Abel, Phillip B.
AU  - Whalen, Mike F.
AU  - Hendricks, J. Lynne
AU  - Bodis, James R.
PY  - 1999
UR  - https://ntrs.nasa.gov/citations/19990047656
ID  - 19990047656
ER  -