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4. J.H. Lambert, Photometria sive de mensura et gradibus luminis, colorum et umbrae [Photometry, or, On the measure and gradations of light, colors, and shade] (Augsburg (Augusta Vindelicorum), Germany: Eberhardt Klett). See especially p. 391, (1760).
5. Beer, Bestimmung der Absorption des rothen Lichts in farbigen Flüssigkeiten (Determination of the absorption of red light in colored liquids), Ann. Phys. Chem. 86, pp. 7888, (1852)