TY  - RPRT
TI  - Pulse-echo imaging using a nondiffracting beam transducer.
AU  - J Y Lu
AU  - J F Greenleaf
PY  - 1991
DO  - 10.1016/0301-5629(91)90048-2
UR  - https://pubmed.ncbi.nlm.nih.gov/1887512/
ID  - 1887512
ER  -