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3. CIE Publication 142: Improvement to Industrial Colour-Difference Evaluation. CIE Central Bureau, Vienna (2001)
4. CIE S 014-6/E:2013: Colorimetry – Part 6: CIEDE2000 Colour-Difference Formula. CIE Central Bureau, Vienna (2013)
5. CIE Publication 15.2: Colorimetry, 2nd edn, Note 9, p. 33. CIE Central Bureau, Vienna (1986)