@article{ref1,
title="Accident trends for air medical helicopters. 1988 accidents up from 1987, but set second lowest record this decade",
journal="Hospital aviation",
year="1989",
author="Collett, H. M.",
volume="8",
number="2",
pages="6-11",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0740-8315",
doi="",
url="http://dx.doi.org/"
}