@article{ref1,
title="The Dark Adaptation Test for Vitamin A Deficiency",
journal="American journal of public health",
year="1938",
author="Palmer, C. E.",
volume="28",
number="3",
pages="309-315",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}