TY  - RPRT
TI  - Photometric calibrations 
AU  - Booker, Robert L
AU  - McSparron, Donald A
PY  - 1987
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 250-15
DO  - 10.6028/NBS.SP.250-15
ER  -