TY  - RPRT
TI  - Nanoscale Subsurface Imaging via Resonant Difference-Frequency Atomic Force Ultrasonic Microscopy
AU  - Cantrell, Sean A.
AU  - Cantrell, John H.
AU  - Lilehei, Peter T.
PY  - 2007
UR  - https://ntrs.nasa.gov/citations/20080007508
ID  - 20080007508
ER  -