This paper reviews the sampling of color spectra and its effect on the accuracy of derived properties such as CIE tristimulus values and color rendering indices. The details of numerical computation are considered; the errors and their sources are discussed.
H. J. Trussell, "A Review of Sampling Effects in the Processing of Color Signals" in Proc. IS&T 2nd Color and Imaging Conf., 1994, pp 26 - 29, https://doi.org/10.2352/CIC.1994.2.1.art00007