@article{ref1,
title="The relation between dark adaptation and the level of vitamin a in the blood",
journal="Journal of clinical investigation",
year="1942",
author="Haig, C. and Patek, A. J.",
volume="21",
number="4",
pages="377-383",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9738",
doi="10.1172/JCI101313",
url="http://dx.doi.org/10.1172/JCI101313"
}