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Ikeda, Mitsuo; Nakano, Yasuhisa. (1986). Spectral luminous-efficiency functions obtained by direct heterochromatic brightness matching for point sources and for 2° and 10° fields. josaa/3/12/josaa-3-12-2105.pdf, 3(12), 2105–0. doi:10.1364/JOSAA.3.002105 
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