@article{ref1,
title="Visibility of cockpit instruments",
journal="Journal of aviation medicine",
year="1950",
author="Barr, N. L.",
volume="21",
number="4",
pages="328-42; passim",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-991X",
doi="",
url="http://dx.doi.org/"
}