2020DIN EN ISO/CIE 11664-1:2020-03 Colorimetry - Part 1: CIE standard colorimetric observers (ISO/CIE 11664-1:2019); German version EN ISO/CIE 11664-1:2019
2020DIN EN ISO/CIE 11664-1:2020 Colorimetry - Part 1: CIE standard colorimetric observers (ISO/CIE 11664-1:2019)