@article{ref1,
title="Color vision defects in the elderly",
journal="Journal of gerontological nursing",
year="1980",
author="Andreasen, M. E.",
volume="6",
number="7",
pages="383-384",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0098-9134",
doi="",
url="http://dx.doi.org/"
}