TY  - RPRT
TI  - A simplified procedure for calculating the directr compnents of contrast rendition factor and equivalent sphere illumination 
AU  - Murdoch, Joseph B
PY  - 1977
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 77-1303
DO  - 10.6028/NBS.IR.77-1303
ER  -