@article{ref1,
title="Visual standards and flight performance",
journal="Journal of aviation medicine",
year="1947",
author="Viteles, M. S.",
volume="18",
number="6",
pages="528-547",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-991X",
doi="",
url="http://dx.doi.org/"
}