Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Sang Yul Choi and Jeong-Min Hwang,Clinical investigation: Ishihara test in 3- to 6-year-old children,Japanese journal of ophthalmology : the official international journal of the Japanese Ophthalmological Society,00215155,[Tokyo] : Springer,2009,53,5,455-457,https://cir.nii.ac.jp/crid/1522262180308322432,https://doi.org/10.1007/s10384-009-0716-1