@article{ref1,
title="Courses of dark adaptation and levels of vitamin A and carotene in normal and clinical conditions",
journal="Federation proceedings",
year="1948",
author="Sheard, C.",
volume="7",
number="1 Pt",
pages="113-113",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0014-9446",
doi="",
url="http://dx.doi.org/"
}