TY  - RPRT
TI  - Transducer beam pattern test object.
AU  - L V Hefner
AU  - J A Parks
AU  - A Goldstein
PY  - 1980
DO  - 10.1002/jcu.1870080103
UR  - https://pubmed.ncbi.nlm.nih.gov/6766478/
ID  - 6766478
ER  -