@article{ref1,
title="Use of roll-angle indicators for avoiding spatial disorientation during instrument flight",
journal="Aerospace medicine",
year="1967",
author="von Diringshofen, H.",
volume="38",
number="4",
pages="401-401",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}