1. Light sources and color rendering;Nickerson;J Opt Soc Am,1960
2. CIE Technical report: Method of Measuring and Specifying Colour Rendering Properties of Light Sources. Publication CIE No. 13.3 1995 16
3. A flattery index for artificial illuminants;Judd;Illum Eng,1967
4. Color-discrimination index;Thornton;J Opt Soc Am,1972