TY  - RPRT
TI  - Method to determine the quality of sapphire 
AU  - Duffy, M T
AU  - Zanzucchi, P J
AU  - Ham, W E
AU  - Corboy, J F
AU  - Cullen, GW
PY  - 1980
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 400-62
DO  - 10.6028/NBS.SP.400-62
ER  -