Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) IINO Koichi and FURUYA Seiji and HASEGAWA Takayuki,Practical Evaluation of Color-Difference Equations for Perceptually Close Color Reproduction of Unprintable Spot Colors on DDCP,Journal of Printing Science and Technology,0914-3319,The Japanese Society of Printing Science and Technology,2003,40,2,97-108,https://cir.nii.ac.jp/crid/1390282679067132416,https://doi.org/10.11413/nig1987.40.97