From Wyszecki & Stiles (1982),Table II(2.4.6)
Wyszecki, G., & Stiles, W. S. (1967). Color Science: concepts and methods, quantitative data and formulae. (1st ed.). New York: Wiley.
Wyszecki, G., & Stiles, W. S. (1982). Color Science: concepts and methods, quantitative data and formulae. (2nd ed.). New York: Wiley.