@article{ref1,
title="A study of defective colour vision with the Ishihara test plates",
journal="Annals of human genetics",
year="1967",
author="Gorrell, G. J.",
volume="31",
number="1",
pages="39-43",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-4800",
doi="",
url="http://dx.doi.org/"
}