@article{ref1,
title="Helicopter crashes: some new concerns",
journal="Hospital security and safety management",
year="1986",
author="",
volume="7",
number="6",
pages="5-7",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0745-1148",
doi="",
url="http://dx.doi.org/"
}