TY  - RPRT
TI  - Ultrasonic materials characterization 
AU  - Berger, Harold
AU  - Linzer, Melvin
PY  - 1980
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 596
DO  - 10.6028/NBS.SP.596
ER  -