1. Intersections of spectral power distributions of lights that match
2. The Measurement of Colour, Fourth Edition, Van Nostrand, NY (1969); p. 66.
3. , and , Numerical Recipes, Cambridge Univ. Press, New York, 1986.
4. and , Color in Business, Science and Industry, Wiley, 3rd Ed. New York, 1975.
5. What is Metamerism?