Page:Tristimulus specification of the Munsell book of color from spectrophotometric measurements (IA jresv31n1p55).pdf/29

 [16] Preparation and Colorimetric Properties of a Magnesium Oxide Reflectance Standard. Letter Circular NBS LC547 (March 1939).

[17] K. S. Gibson and H. J. Keegan, Calibration and operation of the General Electric recording spectrophotometer of the National Bureau of Standards, J. Opt. Soc. Am. 28, 372 (1938).

[18] K. S. Gibson, Survey of spectrophotometers, Paper Trade J. 111, 135 (1940).

[19] Raymond Davis and K. S. Gibson, Filters for the Reproduction of Sunlight and Daylight and the D etermination of Color T emperature. BS Miscellaneous Pub. M114 (1931).

[20] Lila F. Knudsen, A punch card technique to obtain coefficients of orthogonal polynomials, J. Am. Statistical Association 37, 496 (1942).

[21] Dorothy Nickerson, Use of ICI Tristimulus Values in Disk Colorimetry. A Preliminary Report. U. S. Department of Agriculture (May 1938).

[22] Photoelectric "Colorimeters." Letter Circular NBS LC545 (March 1939),

[23] J. A. Van den Akker, A survey of abridged spectrophotometers. Paper Trade J. 111, 142 (1940).

, May 25, 1943.