@article{ref1,
title="Proposed spatial orientation flight training concept",
journal="Aerospace medicine",
year="1974",
author="Dowd, P. J.",
volume="45",
number="7",
pages="758-765",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}