@article{ref1,
title="Blood vitamin "A" level and dark adaptation",
journal="Bulletin of the Ophthalmological Society of Egypt",
year="1976",
author="el-Hag, T. A. and Mekkawi, M. F. and el-Sheyati, M. F. and Eid, S. Z.",
volume="69",
number="73",
pages="653-660",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0078-5342",
doi="",
url="http://dx.doi.org/"
}