TY  - RPRT
TI  - Collaborative reference program for color and appearance : color and color difference : report no. 31
AU  - Cummings, T L
AU  - Horlick, J
PY  - 1980
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 80-1830
DO  - 10.6028/NBS.IR.80-1830
ER  -