Color Universal Design: analysis of color category dependency on color vision type. - Yasuyo G. Ichihara; Natsuki Kojima; Kei Ito (Color Imaging: Displaying, Processing, Hardcopy, and Applications, 2010)

Color universal design: analysis of color category dependency on color vision type (2). - Natsuki Kojima; Miyuki Kamachi; Yasuyo G. Ichihara; Kei Ito (Color Imaging: Displaying, Processing, Hardcopy, and Applications, 2011)

Color universal design: analysis of color category dependency on color vision type (3). - Natsuki Kojima; Yasuyo G. Ichihara; Tomohiro Ikeda; Miyuki Kamachi; Kei Ito (Color Imaging: Displaying, Processing, Hardcopy, and Applications, 2012)

Color universal design: analysis of color category dependency on color vision type (4). - Tomohiro Ikeda; Yasuyo G. Ichihara; Natsuki Kojima; Hisaya Tanaka; Kei Ito (Color Imaging: Displaying, Processing, Hardcopy, and Applications, 2013)