@article{ref1,
title="Cause factor: human",
journal="Air Medical Journal",
year="2000",
author="North, M.",
volume="19",
number="1",
pages="4-5",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1067-991X",
doi="",
url="http://dx.doi.org/"
}