TY  - BOOK
AU  - Bureau of Indian Standards
TI  - Specification for Optical Flats (IS : 5440 - 1969)
U1  - IS : 5440 - 1969 
PY  - 1970///
CY  - New Delhi
PB  - Bureau of Indian Standards
KW  - Indian Standard - IT
N1  - IS : 5440 - 1969
ER  -