@article{ref1,
title="The gyroplane",
journal="Aviation, space, and environmental medicine",
year="1999",
author="Elsner, P. J.",
volume="70",
number="6",
pages="626-626",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-6562",
doi="",
url="http://dx.doi.org/"
}