TY  - RPRT
TI  - A high resolution ultrasonic microscope.
AU  - A Penttinen
AU  - M Luukkala
PY  - 1977
DO  - 10.1016/0041-624x(77)90082-8
UR  - https://pubmed.ncbi.nlm.nih.gov/898384/
ID  - 898384
ER  -