@article{ref1,
title="Vitamin A toxicity",
journal="Medical letter on drugs and therapeutics",
year="1980",
author="",
volume="22",
number="4",
pages="19-20",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0025-732X",
doi="",
url="http://dx.doi.org/"
}