@article{ref1,
title="Combined effect of vitamins A and E on dark adaptation in man",
journal="American journal of optometry and archives of American Academy of Optometry",
year="1960",
author="Fang, H. S. and Hall, A. L. and Hwang, T. F.",
volume="37",
number="",
pages="93-98",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9408",
doi="",
url="http://dx.doi.org/"
}