TY  - RPRT
TI  - Optical radiation measurements : photometric calibration procedures
AU  - Burns, Velma I
AU  - McSparron, Donald A
PY  - 1972
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 594-3
DO  - 10.6028/NBS.TN.594-3
ER  -