@article{ref1,
title="Painted helicopter main rotor blades and flicker-induced vertigo",
journal="Aerospace medicine",
year="1969",
author="Bynum, J. A. and Stern, J. A.",
volume="40",
number="6",
pages="622-626",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}