Numerical Determination of Tristimulus Values
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I consider numerical methods for evaluating the tristimulus values of P, an arbitrary spectral power distribution. Various classical quadrature rules are discussed, and numerically stable algorithms for their construction are presented. I mtroduce a new quadrature rule developed specifically for evaluating tristimulus values. The method involves the simultaneous generation of three quadrature rules sharing a common set of nodes that is optimal in a sense much like the optimality of the Gauss rules.
Journal of the Optical Society of America A, Vol. 11, No. 12, December 1994, pp. 3152-3161.