TY  - RPRT
TI  - A general-purpose computer program for studying ultrasonic beam patterns generated with acoustic lenses
AU  - Roberti, Dino
AU  - Ludwig, Reinhold
AU  - Looft, Fred J.
PY  - 1988
UR  - https://ntrs.nasa.gov/citations/19880051890
ID  - 19880051890
ER  -