TY  - RPRT
TI  - DONAR - A computer processing system to extend ultrasonic pulse-echo testing.
AU  - Lees, S.
AU  - Gerhard, F. B.
AU  - Barber, F. E.
AU  - Cheney, S. P.
PY  - 1973
UR  - https://ntrs.nasa.gov/citations/19730052646
ID  - 19730052646
ER  -