Photoelectric Color-Difference Meter. Hunter, R. S. Journal of the Optical Society of America (JOSA), 38(7):661, 1948.
bibtex   
@article{Hunter1948,
	title = {Photoelectric {Color}-{Difference} {Meter}},
	volume = {38},
	number = {7},
	journal = {Journal of the Optical Society of America (JOSA)},
	author = {Hunter, Richard Sewall},
	year = {1948},
	keywords = {color},
	pages = {661},
}

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