@article{ref1,
title="Studies in dark adaptation as a means of detecting deficiency of vitamin "a"",
journal="British journal of ophthalmology",
year="1944",
author="Robertson, G. W. and Yudkin, J.",
volume="28",
number="11",
pages="556-568",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-1161",
doi="",
url="http://dx.doi.org/"
}