TY  - RPRT
TI  - Spectral irradiance calibrations 
AU  - Walker, James H
AU  - Saunders, Robert D
AU  - Jackson, John K
AU  - McSparron, Donald A
PY  - 1987
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 250-20
DO  - 10.6028/NBS.SP.250-20
ER  -