@Article{	  Brown49,

author = {W. R. J. Brown and D. L. MacAdam },
title = {Visual sensitivities to combined chromaticity and
luminance differences},
journal = {Journal of the Optical Society of America},
year = {1949},
volume = {39},
number = {10},
pages = {808--834},
theme = {vision,ecarts}
 }