TY  - RPRT
TI  - Circular of the Bureau of Standards no. 429: photoelectric tristimulus colorimetry with three filters
AU  - Hunter, Richard S
PY  - 1942
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 429
DO  - 10.6028/NBS.CIRC.429
ER  -